This may not be a bad option depending on what type of media you use.
It's the JVC KD-AR960. This sucker can take SD cards which go up to 2GB now along with a nice ultra II transfer rate. Obviously it depends on what devices you currently use. I have a PDA, a portable media center that uses SD, and a built in SD reader in my laptop which makes life grand with a handful of SD cards. You can have different types of music on different discs or movies on the cards. Having this head unit would be a great addition to my arsenal and may suit your needs. They have a few models that are more expensive, but this is the cheapest one.
Good luck on your search.