My '03 seats fold flat as well. Perhaps they designed the '04s with a more intuitive design?
Also, I would prefer the aftermarket SAT radios than getting it from the factory as you can get a portable SAT and take it with you in whatever vehicle you have.
My friend has a portable that plays through the stereo FM and his portable has a built in FM Transmitter (I think he has XM). My first thought was that the FM Transmitter probably transmitted with some background noise and static, but it doesn't. It's actually clear. The only time you lose signal is under a tunner or under a rather large leafy tree. I was surprised the built in FM Transmitter was sending a strong signal (vs the portable FM Transmitters that you buy at Best Buy and Radio Shack).
The lighted running boards would be nice, but I guess the engineers thought the integrated light in the side mirrors was enough (they're bright enough)