If you want warm and clean, go Eden Nemisis...used if that is what it takes to get into the line. I've bought plenty of used gear to get much more than I could afford new and never have regretted it. As for power, a bass player should have at least twice the power of the guitarist to be heard well. If you just can't go that way, look at a Fender Rumble 100. My son's first amp was the Rumble 100 1x15 and it is still producing quality sound for practice and small gigs. My only complaint about the Rumble series is that it doesn't have aux speaker connections. But the amp is running 100w at 4ohms with the 15" driver it came with already and does a good job.