The Emo seems to be a bit of a gamble, some have been fine and others have not when driving 4 Ohms so that is up to you to decide if you want to try that out.
On the other hand, if you choose to go the pro amp route, consider a couple of points....they are the best bang per $$ out there, as far as power goes. They're usually not all that "pretty", but some are not too bad. The fan noise may or may not be an issue for you...it depends on how loud you are playing, at lower levels the fan(s) may not even kick in. Remember that pro amps are built for the road and are usually not pushed anywhere near as hard in a home enviro. Nevertheless, there are some threads on the web reg. swapping out the fans on some units like the Behringers, to a much quieter fan(quite simple from what I've seen). Zimm(Charles) has disconnected his fan on his QSC altogether, with no issues other than a little extra heat.
Behringer makes a fanless amp, the A500, which many HT owners seem to like, although a few quality issues have shown up on some forums.
Another point to consider is the inputs/output connections...QSC GX's and Behringer EPX's and A500 have RCA inputs and Banana/spade outputs that some other pro amps don't have.
