Well as Juho said, most people use it in the studio and stage monitoring is usually taken care of. Anyway, there's quite a lot of gear you can use to light up the sound of the Virus. Hmm.. Dream rig. Perhaps running the virus through two fender bassman '59 or vox ac30 reissues?
Amps aside, valve gear is very popular for recording, especially with digital equipment. Spl makes an affordable 2 channel valve processor called the charisma2:
http://www.soundperformancelab.com/C.../in_short.html
If you have more to spare, check out the tla 5051, or 5052:
http://www.tlaudio.co.uk/tlaudio/docs/products/5052.htm