why are you limited to that much? if you mean because of how much $ you have thats not the case.
you can get a cadence 1200C online for $250 and it will put out I think 750 x 1 @ 4 ohm or 375 x 2 @4 ohm
what subs are you going to run? I could help more if I had some specs on them
oh and you woould only notice a very slight difference with 50 watts.
