My Comments follow...

>Just get an iPod / other mp3 player and a compatible head unit.

I have no use for iPods or the like. Although this head unit has integrated iPod controls

> 1. No CD player? Everyone is going to wish they had one at some point - I have an aftermarket headunit with my ipod and I tell my friends to bring their cd's in all the time.

I listen to CDs in my Crossfire very infrequently. There's no convenient place to put the jewel cases where they won't slide.

> 2. SD Cards? Small and annoying.

Small, cheap, and convenient!