Well, I've currently got the Pioneer Premier DEH-P980BT, and I just ordered the Excelon KDC-X993. It should be here early next week. The Pioneer models also have the single rotary command knob...everything has to be accessed via the knob. Occasionally with my P980, I've found that while trying to use the knob, I end up in the wrong menu because instead of pushing straight in, I rocked it slightly sideways. Not a big deal for me, I just back back out of the menu and try again. I've found that for me, I'm not typically trying to scroll through a bunch of menus while I'm driving. I turn the radio on, or pop in a CD, or now, plug in the Ipod, and off I go. Most of my initial settings (crossover/slope/EQ) are setup as soon as I install the unit. The only thing I may need to change while driving is the radio station, or song track...and that's easy enough.
The reason I'm going to try the X993, is because of my Ipod. I got a Nano 5g for Christmas. I'll need to buy the Ipod controller breakout box for the Pioneer, and it WON'T charge a 5g Nano, so I'd have to buy a separate adapter for that...total cost for the 2 is around $170 shipped to me. For $200 shipped to me, I should be all set with the X993! Also, the X993 will play the Ipod files through the Wolfson 24 Bit DAC, bypassing the Ipod's DAC.
I almost bought an Eclipse CD7200MkII, but I couldn't justify the cost. I'm glad I didn't buy it, now that it looks like Eclipse is getting out of the market.
You're doing the right thing by doing your research before you buy. You may find that you may need to make a few concessions though...at a $250 price point, the PERFECT H/U (for you) may not exist.