need an amp head on a budget, playing lots of old avenged sevenfold, slayer, megadeth and pantera... thinking of the orange cr120, sounds good and is reliable and well priced, any other suggestions? also how loud can the cr120 go with a 2x12 cab with v30s... id be using it to gig in an auditorium with about a 1000 peope would it be loud enough?