If you're happy with your existing bass, then carry on playing it I have found that g*****ists are noisy bastards, aren't they?? I used to have a 300w Trace rig which was ample for many years, but then my guitarist for The PHD got a couple of the Line 6 Spider II combos, pushing 150w. Completely buried my sound. Now I've got the Markbass stuff, I'm running 500w at 4ohms & life is sooo much easier. The answer? Perhaps get a cheapish 500w combo. Ashdown MAG series, perhaps? I think they do a 600 for reasonable money, don't they?