For 2 15L7s, forget 200wrms. I'm throwing 2000wrms to 2 12L7s and I swear sometimes they seem like they want more. IMO, for 2 15L7s, you want 2500wrms. You can get away with 2000, but I think they'll really shine with 2500. If you're gonna do it, go ahead and do it right the first time. I'd only go with a 2000 watter if you get an amazing deal.