Dude, if you keep buying flea market junk like boss, lanzar or SPL, the amp will just fry again. Its cheap crap! Look, you already have to spend more money for a new amp.... so just buy a good one this time! You get what you pay for.... BTW, peak power means NOTHING, its all marketing. Most good amps dont even advertise the peak power which means nothing in the real world.
Look for a refurbished kicker on ebay. Your flea market SPL amp was likely not even 700 REAL watts.