Thanks for the suggestions guys. Yeah, Rich I really want an Alpine. I really want the CDA-7893 or 7895; lost one this morning on Eghey that went for $250!!!!!. The 7895 was hands down the cleanest HU I have ever owned. That 7998 is the is really cool too. I'll think into that one. I think with the KCi-422 adapter anything with the AiNet will work for the iPod from what I've read.
Also, I guess it doesn't have to be pre-amp only....
Something that has power yet can be disabled would work too. That's how the CDA-7893 and 7895 are.