i dunno about the hifonics brutus in terms of reliability... most reliable & consistent amp i have ever seen is a pheonix gold titanium series amp. believe it was 1000W rms or so @2 ohms? maybe 1ohm, not sure... but at a local car audio shop some guys stole the show with a 3 minute deathmatch score averaging 151.1db throughout the entire time. this same team also won every other competition they entered with the same amp... of course it helped that they were runnin a single 15" PG titanium sub in a horn loaded enclosure, rediculously loud!! haha i'm a dork
but if you want something that will be reliable as hell, and put out good spl numbers, check out adire brahmas 15", beefy motor structure, big magnet, & fat surround. go to:
http://www.adireaudio.com/