I need an amp to power my Audiomobile MASS 12" which is 4 ohm SVC. I'm looking for something with around 600 watts rms or higher. I previously had a bridged ESX Q1752 powering the sub. I'm on a very limited budget and want to stay under $250, under $200 would be even better if at all possible. I don't mind a used amp or a basic RF as long as it will hold up. What do you guys recommend?