I forgot to mention that the truck I found was over 300 miles away and my local dealer was more than happy to drive out and pick it up for me and had no problems about the X-Plan. The only problem was it had 320 miles on it when I got it but at least if it had broke down right off it would have been on them. And it didn't!!
The truck even had the window tint, nerf bars and bug shield on it from the other dealer which I would have added myself but was glad I didn't have to.

 

The power rear window? Both rear side windows are power and evacuate the cab just as quick! Audiophile system... then I can't hear my dual exhaust. I compromised on about the same items as you mention, but frankly the 5.4 V8 and the 18 inch wheels were more important to me so I went with it. BTW the standard stereo is excellent!

 

I have both the power rear sliding window and the audiophile in my truck and I think they're both worth holding out for. The audiophile is nice for obvious reasons. The power rear window is definitely worthwhile if you're going to drive around with the windows down often. I've noticed buffeting if the slider is closed, and opening it allows that air pressure to get out. Of course, if you really want to experience buffeting in the cabin, try a Liberty on the freeway with the windows down.

I'd try driving one with the power rear window and one without it, with the windows down. There is quite a difference. If you don't drive with the windows down, then the lack of the power rear window might not be much of an issue.