So i've decided to buy an Axe FX but want to use my 2x12 avatar cab w/modeling speakers to go with it. I don't plan on gigging with this rig so i don't need a lot of power. I'd basically be using the cab as a monitor at home. Any suggestions on a good power amp to use with this setup? I'd like stay under $500 and am willing to buy used as well, but of course the best bang for the buck is what i'm interested in. What should i look into?