Artists use this
Great Multi-Purpose Practice Amp
While it has been replaced with the much nicer V3 Rumble, the V1 is a solid amp if purchased used and in good condition (worth about $1-200 used from what I've seen). It's got great sound and some handy features (active pad, effects loop/pre out + power in, RCA in, adjustable XLR out). A little on the bulky side. Doesn't handle lower tunings too well unless you've got some thick strings on there to make the harmonics clearer, but for E down to C it sounds solid.