| 350 watts is a powerful amplifier. If you play in a really large setting, if for some reason it is not loud enough, the soundman will most likely run an XLR from the amp and put you through the PA. You will certainly notice the upgrade from 75 watts!
However, I think the best advice is for you to take your time and shop around. Go to a music store with a large inventory, bring your bass, and try everything out. Don't limit yourself - try different brands and different models. Ask questions. Do some online research as well. But be sure to TRY them - go with the one whose sound you can't live without.
I myself bought an Acoustic B200 the other day on sale, and I absolutely love it. HUGE sound, big and warm, ridiculously loud for its size. I had played an SWR for many years but wanted something new. I tried out a bunch of different amps, and for the combination of sound and price, Acoustic was the clear winner. Maybe next time it will be someone else.
Good luck! |