So my younger cousin is learning to play bass, and is a natural at it. Ive offered him a place in my band because I know he practices alot and is into the same music as the rest of my band. The problem is he is playing through a guitar amp and of course needs a bass amp. Hes looking for something around 40-50 watt, and not a tube amp. He currently has $200(Canadian) and will have another $300 within a week. What amps would do him well to get a decent Thrash metal tone?