Here is another option if you are looking for an unconventional way to drive a system to great power for less $.

Prbably a better result by definition. Powered Studio monitors. I've seen it done before by Ethan Winer of Realtraps. I've heard the 5" models and they play very loud and clean, and suprisingly low. The 8" models would not require a sub at all. RCA cables from Pre-outs and good to go.

http://www.mackie.com/products/mrmk2series/splash/

I have the Mackie 8" models, but I'd still like an EP400 to accompany them!

Edit: I should note that they probably don't NEED the sub, but I'd still like to go an octave lower at times!

Oooops- too late to edit:

I didn't realize that Mackie came out with less expensive models. I haven't heard those; mine are the 824s.

Re pro amps, there are numerous forums online about swapping out noisy fans on Crown, QSC, Behringer ect....truth is, if you're looking at pro amp power, you'd likely be listening to it so loud you would only notice the fan on the very quietest passages. The other option is simply to have your amps in an isolated area or different room. Behringer's A500 is a fanless option as well.

I have seen a setup with pro amps where most of the equipment is in a server-style rack (with doors etc) which was located under the staircase in a basement. With good isolation, there was no perceptible noise; but I thought the money and effort for the setup could've been used differently.
I found out that the love for pro amps is very strong :-).