I, too, use the Denon HD2500 and absolutely love it. If you also get the BU-4500 CD drawer unit (as I did...), you can actually play music from four sources at once, which makes things very easy if you want to go deep into the mix. The flexibility with this unit still amazes me sometimes.
It is a bit scary if the unit experiences a 'hiccup' or something during an event. It's happened to me a couple of times, but not at all after one of the last firmware updates. Having the CD unit saved me though, as I was still able to continue on with my performance without guests noticing.
As Scott said, the unit has been improved dramatically in the eighteen months that I've owned it. I thought it was a huge bargain when the price was reduced to $699 (which coincided with the release of the HD5500, I believe) so I have no problem with the price being brought back up to $899. I will be purchasing another at the end of the season!!