I've got a 1x12 Lopo cab with a C-Rex and and am looking to pick up a modeller for home use. My budget is $500 or less. I'm more worried about realistic amp sounds than effects. It could be a head or floor unit. My main tones are modern heavy (Dream Theater, Opeth) and classic rock, but a decent clean would be nice. Any suggestions? I'm not clear on what units can plug right into my cab and which would need a power amp.