What's the greatest bargain in SET these days?

My Zu Def 4s have a built-in powered subwoofer so that any limits to bass extension inherent in an SET approach are eliminated. As I have noted previously, I evolved from a 45 to a 2a3 to a 300b SET. The 45 and 2a3 just sounded thin - perhaps, in part, because of very long speaker wire runs from one side of my living room down and through the basement to the other side. I also tried an EAR 859 that seemed too objective and did not allow the richness and tone of the Def 4s to shine. Ultimately, I settled on a 300b. (I also tried higher powered digital amps to see if I was missing any "oomph" and was pleasantly surprised by what a 300b SET could do.) As everyone has noted, the match between speaker with SET seems to be a bit more finicky than the match with other topologies. The issue becomes the management of the cost of experimentation. In my case I used Audiogon to purchase the first three or four amps that I tried before commissioning a new Ancient Audio custom-made 300b SET. I was able to buy and sell the progression of pre-owned amps without losing money - including shipping. It just took patience. Audiogon has become a tremendous resource in that regard.

Charles,
Last night, I was thinking that I should just get myself a Dynamo and be done with it and have a bunch of money left over for re-tubing. However, since the consensus here seems to be that the 300 B is something really special and that I should try to move in that direction to "get it right the first time" if possible, then it looks like I am looking at either the Audio Note Kit 1 or that Audio Nirvana piece from David.
The appealing thing about the Audio Note proposition is that I would know exactly what's in it, I would have the fun project of building it, and it is clearly heavily upgradable. Brian was nice enough to make me an offer with the better capacitors at dealer cost ($160) and the shipping fee waived. I also get three inputs and, I would imagine, better resale value, if needed, than pretty much any other kit because of the Audio Note reputation. Anyway, this would bring me in just a hair under my maximum budget. The only thing that gives me pause about this option is something I read in the assembly manual, which is online. It says something like, "The stock tubes are fine for testing and burning in, but a few months down the road you may want to get yourself some better tubes." The idea that I am going to have to sink more money into the amp so soon for it to show what it can really do is a little disconcerting! Thoughts?
As for the Audio Nirvana amp, it is very tempting because of the price and the possibility of discovering "The Greatest Bargain in SET Amps These Days." :-)
My hesitation would come from the untested nature of the beast, and from the fact that David seems to be, as far as I can tell, running this operation out of his home. (His wife picked up the phone the first time I called and I heard, "honey, you have a customer!") Of course, this is not unheard of in the Wacky World of Audio Manufacturing and distribution, but it does make you think. Of course, on the other hand, it's probably exactly is kind of small-scale operation that makes his pricing structure possible. He or, in this case, his engineer friend, design the products, have them manufactured in China, and then sell them here at a very low profit margin.
When I spoke with him yesterday, I asked him about the warranty situation. He said, in effect, that he hadn't had to think about it all that much because he had never had any returns on his first tube amp, which is a 6V6, Push-pull affair. I told him that I have a great, local repair shop here and I'm pretty sure he said that if it needed repairs, he would pay for them to be done locally.
I do have a certain hesitation around buying gear made in China. I really, really don't want this wonderful thread to be diverted into the topic of eastern versus western made audio gear. There are plenty of other rancorous threads for that purpose! I am not concerned about quality, because I know that there is some superb stuff coming out of China these days. I am more concerned about the ethics of relatively well off people in "first world" countries buying their luxury goods on the backs of workers in lower wage countries. But again, I'm not judging any of you who don't feel the same way or have the same qualms about this. But I'll call David today and ask about parts quality.

Rebbi,
You really began what's become a very good and interesting thread. It does raise real world purchasing issues. Buying components when it isn't possible to audition prior to paying for them. This was my situation over 5 years ago before buying the Frankensteins brand new. My very first post on this site in 2009 was seeking out owners of this amplifier. I was so inspired by their response and enthusiasm(some via private email) I took the chance. To say it worked out fine is an understatement. I realize it doesn't always turn out that way. I can relate to your position and that's why I try to contribute in some fashion.
Charles,

Charles,
You have been extremely helpful, thank you!
What do you think of the tube quality "issue" on the Audio Note kit?
Sounds like you are very curious about that Audio Nirvana amp, yes?