I think a MX130 or C39, plus a MC7106 amp, can easily get you there on that budget. Make sure the processor has been modded for a six-channel input (or it's a later MX130 that came with one stock).
You can then use the 5.1 analog outs from your Oppo and run HDMI directly to the monitor. The main drawback is that your other sources (i.e. cable TV) will be in Pro Logic only.
You can then use the 5.1 analog outs from your Oppo and run HDMI directly to the monitor. The main drawback is that your other sources (i.e. cable TV) will be in Pro Logic only.