Best 845 tube out there?


I am running a pair of Cary CAD-211AE monoblocks with the standard no-name Chinese tubes shipped by Cary. Whilst I am happy with the sound, I think I should buy a pair of 845's to keep as backup in case something happens to these tubes.

Because I will need to buy FOUR of them, this rules out any tube that sells for stupid money (e.g. vintage RCA 845 tubes).

The only current production 845's I am aware of are:

- Shuguang 845 "standard"
- Shuguang 845B
- Shuguang 845C
- Shuguang PSVANE 845
- KR Audio 845

I have found reviews of the Shuguang 845B and 845C, but there is virtually no information out there on the new Shuguang "psvane" 845. Has anybody heard this valve, and is it a noticable improvement over the 845B and C? Also, what do people think of the KR?
amfibius
To add to my "mini review" ...as in a few posts previous to this...the Kr845 has a significantly lower noise floor then the 845m or the 845b. It is extremely quiet. It sounds like a hybrid between a 300b and an 845 if you can imagine that, combining a sense of "lushness" and sound staging like that of a 300b but with the linearity of a 845. I have no reasons to want to go back to listening with a 845b or a 845m. If i am going to be serious about my music playback i have to utilize a KR845 in my system and build the system, ie cords , around it. With this tube there is no fooling around. To balance this positive review i know of a few people who do not like it. They say it is coolish. I have an inkling as to what they might be referring too but it has within its sonic envelope attributes that can't be found in the other 845 tubes that i mention and therefore deserves to be accommodated into a system via system matching. I need to make it work because its got something! My 845m and 845b are up for sale as i write this.
Ampfibius.
Could you tell me what is the value of the bias capacitor in yours Cary 211? Thanks
Havent heard it, but Hightech Production Made in Germany is worth to mention:

ELROG ER 845

german review from stereoplay magazine:

http://www.stereoplay.de/ratgeber/made-in-germany-elrog-er-845-1158090.html
I bought my Belcanto seti 40 with 3 pairs of Shuguang 845's- regular aluminum base graphite electrode, type B's, and a pair of metal plates.
The aluminum ones were noisy within an hour or so of use, the B's were "OK", and the metal plates were ethereal! Unfortunately the metal plates didn't last forever, the actual metal electrode plates overheated, flared and came loose with time, they did last for 2 yrs though. I am currently using B's, but have ordered 2 pairs of metal plate 845's from "chinesetubes.com", I have read that if the metal plates test out ok for 30-40 hrs they are likely to last "the distance". Chinesetubes.com have a 60 day return policy so at just under $200 for a pair I'm willing to give them a try, until hopefully Shuguang change their policy and make more Noblemen type tubes. In short,if your amp can handle them, the best non NOS 845's are the metal plate Shuguangs.
I used the metal plate Shuguangs for a couple years and find the Pavanes (Psvanes) much more to my liking. More open and dynamic and less (for lack of a better word) "metallic." I did enjoy the metal plate tubes for quite a while, though.