You are looking for a decent and reliable 4 channel amplifier? May I recommend to you the pro audio QSC DCA 1824.
It is an amplifier which is used in Cineplex theaters across North America. As a matter of fact, I am using one in my HT system for the surround channels.
It has excellent specs: True FTC rated 145 watt/ch, all channels driven, with THD of 0.03% from 20 Hz -20K Hz. Unweighted SNR is 107 dB below rated output.
For source signal input, it uses Phoenix type connectors (No XLR). Speaker connectors are screws in a strip.
The only negative feature is that its variable speed cooling fan is a little bit noisy. But there's a way of handling that problem and I understand that you know how to resolve the situation.
Its price is a little bit over your planned budget. But there's a reliable seller on eBay who has two used units in good working order for sale at $849.99. Have a look at this one. That's a good price for a reliable pro audio amplifier with good specs. Moreover, the QSC amps are so well built, you can't kill them. The seller listed it as a dual channel unit but it's a 4 channel amp::
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