Jdfelice,
In addition to a couple of big-buck dedicated CD players, I also own an Oppo Universal Player. Considering the Oppo is a Universal player and some of the Denons are Univeral or multi-format players, I can't figure out what you mean by this statement:
The Oppo's seem to be respectable, but this would not fit my simplicity preference. I always like Denon equipment, is there a Denon model that would be worth buying?
The Oppo and the Denon would be equally "not simple". Honestly, the Oppos are really good for the price. They play CD, HDCD, DVD, DVD-A and SACD. The only issue with the Oppo, or any other universal player, is that they load slowly compared to a dedicated CD player, and you may need to connect to a TV for some functions, like setup for the hi-res formats, etc.
I'm not saying the Oppos are the best $200-$300 players, but they have incredible funtionality, sound very good (considering the price) and generally have unbeatable video quality. They only lack the "jewel-like" build of some of the more expensive units.
Oh, and speaking of simplicity, most/all of the Oppos have variable volume control so you could connect them directly to a power amp, bypassing a pre-amp, if you choos to. I have my highly mod'd Oppo 970 connected direcly to my amps and the built-in remote controlled variable volume control works great for all formats. It's a nice feature that most manufactuers ingore.
Enjoy,
TIC