OP you can probably run around 1000 watts or so with no upgrade to your electrical. That being said I'd just get a single 12 or single 15 (if you can fit it) and a decent monoblock that does around 1000 rms and you should be good for now. You're probably going to want to change your head unit as well if it's stock unless you want to get an LOC (line out converter). Are you getting this installed or having someone do it?