My universal player is dying. Upgrade suggestions?

I just bought a used 3910 for $250. used 5910ci's would be under $800.
When you say "dying" what do you mean? won't play some discs, skips? The special Blue Smoke has escaped? (that is usally what happens to tube equipment!)

Nope, no blue smoke... all my tubes are fine, it's always the solid state stuff that starts failing. The player refuses to send anything other than stereo signals, the front screen stays black while playing, the player refuses to acknowledge any remotes... crabby fellow, won't cooperate.

Which is better, the Denon 5910 or the NAD M-55?

Oppo BDP-83SE. Genuine bargain.

The universal player just doesn't ad up at all when it comes to reliability. They all seem to fail one way or another in there ability to read shortly after purchase.