The hifi is one of the worst lines they made...What subs are you using? If I had to pick 1 I would get the hifi.
Although I don't have a clamp, I am pretty positive my brz2400 does at LEAST 2200.. I wouldnt be surprised if it did rated.. I've heard alot of stuff.. kicker zx2500, fosgate 2500..i like the fact the colossus is a two channel amp. having the versatility to go 1600x2 at 1, 3200x1 at 2, and all tht is just nice for impedences. i remember a guy on here ran two, and was selling them. he said they did about 3400 each. the apk2500 though seems revamped and will do good power. personally, its a hard pick. both arent top brands, but are good for the money.