Nuforce step up from Sunfire for B&W 803N?

Tvad, I hear you, but the synergy issue is exactly what I'm trying to establish by dialogue on and reserach of these boards. It is clear to me that there is a good synergy between Class D like Nuforce/Spectron and tube preamps like Modwright (and possibly Dodd, etc). Once I've seen a pattern that seems to work, I put that on the list. As for price, I'm simply trying to get one of my preferred candidates (synergy established by consensus), and buy at used vs new price so I can maximize my budget. I think that approach makes some sense, no?
What I am trying to establish here is whether the nuforce, etc is a step up from Sunfire. I've gotten conflicting signals so far (including a few PM's), so I may just have to take the leap on the Nuforce and see what happens. However, if I buy it at used price, I lose little if I don't like it and have to sell. Also, it allows me to keep the Sunfire while I audition the Nuforce. I think I'm also going to post a new thread asking whether (if I had to choose one) upgrading the preamp or the amp would make the most difference. Tvad, thanks again for your continued interest. BTW, what system are you running?
Eric, that's very interesting. Don't know how the PSA compares to Nuforce or Spectron, but it seems like the latter have gotten far greater number of rave reviews, so maybe they are better. Don't know, but as Tvad says, I just have to jump in.

Jeffkad reading your thread Tvad gave the best advise, you can save your money buying used by getting a loner from Nuforce to audition most are broke in so that would not be a issue and you could hear if thats the amp for you.

I've been using Ref 9 SE V2s driving Tyler Linbrook Sigs. The impedance at 4 rated ohms is not steady and makes your amp work hard. It appears that your B&Ws are similar. To compare the two i haven't had any issues with my Nuforce amps and most of my listening is classic rock at high DBs. Thats not to say you will be satisfied. Also i use a tubed preamp in the sound chain. Hope you get connected with a amp that pleases you time is a wast-in.

BTW i do understand your thought of having a 2 channel dedicated system. Surround sound only can take you so far. And if your 2 channel system is set up right you get surround sound.