How many watts a piece?
Cost effectiveness- An American legacy is a very decent amp. Had a Legacy 1000 with remote bass, picked it up off ebay for 60 bucks shipped, and it was awesome. I paired it with 2 sony xplode 10" 1600 watt pentagons and a 1.0 Farad Rockford Cap. with 2 guage knuconceptz wiring. Bump Bump.
Competition- well, how much $ ya got?