What 6922 tube will improve bass definition?


I have a Valve Audio Predator hybrid with stock Sovtek tubes. I want to improve the bass definition and grip. The Predator is driving Focus Audio FS8's. Both the Predator and FS8 are neutral but a touch dry, so a little midrange liquidity would be a nice added bonus. I don't want to spend $150+ per tube. Is there a modest priced tube under $100 that will meet these requirements? All suggestions are appreciated.
dayglow
The EH 6922 is a good current production tube.
http://www.upscaleaudio.com/
Check out the EH 6922 type 2 Upscale Audio "Platinum Grade" tested tube.
.
If you are interested in NOS, check out Tubemonger. I've purchased from them and been impressed with their service and quick shipping. A range of tubes and prices.
Tubemonger is great but if you want a new production 6922 I would try the Gold Lion "reissue". Jim McShane over at tube asylum is a very good dealer who stocks them.
The alternative if you can find them, are indeed NOS, but man are they getting scarce. What you want is a full but clean sounding tube. These qualities are tough to find in a single tube. I can tell you my favorite is the Mullard CV-2943 a unique sub. It is not rich and warm like most Mullards but rather a strong clean signal. Other good one are the perrenial favorites like Amperex white lable early 60s, Siemens West German but they run into big bucks. If you want warmth then most Mullard tubes will do it. However it really sounds like you want the GL "reissue"