What amp are you using?

Just wanted to know what amps are u guys (and gals) using with your Nova System. I want to change my Fender '59 Bassman Ltd (a reissue) because the bass sounds woofy and the highs are too ice-picky at high volumes. Also, the nova distortion sounds subpar with this amp. What do you recommend? I need a 40-50W amp that can stay pretty clean at higher volumes.