Thanks Winter, been playing about with studio devil stuff and it's pretty impressive. Primarily I'm looking for guitar amp sims, as my bass tends to go direct through a VT1EQ DI, and I'm more than happy with that.
I was using some of these today
http://www.plugandmix.com/california-tone-642/
and they seem be pretty good, bit limited on features, but really economical on CPU.