I have a Blaupunkt Alaska II head unit that I like. I find it's menu system to be awkward but, thankfully, I don't have to use it that much. It has an adapter for a line input via a male minijack plug. This can then be turned into male RCA jacks with the appropriate adapter(s). You access the Aux input by cycling through the inputs (CD, Radio, Aux) with the source button.

Crutchfield has several Blau CD head units for under $200. If you get a Blau I also recommend the stearing wheel remote. It's very convenient.

-Dylan