The “Go to GC and try all the combos they have” would be a grand total of maybe 2-3 amps, usually Rumbles, at least at my local GC, where the “bass department” is….. limited. That said, the Rumble is a decent amp, but agree you’d need the 500 to keep up with a loud drummer. They have used gear on a random basis, or go online and see what they can get ahold of.