ACS,
Does your 5860 not have pre-outs for an amp? That's only one model below the 5890, which is practically the 1500, and IMO a perfectly fine AVR. I'm not seeing that much of a step up with the budget you've listed, unless all you are looking for is the ability to hook up an external amp. The 2500 from Ubid is the best you are going to do with that budget IMO.