Any single din will work well in the base, Kenwood KDC-155U is solid for 100 bucks.
http://www.woofersetc.com/p-12238-kdc-155u-kenwood-in-dash-cdmp3-stereo-receiver.aspx
http://www.woofersetc.com/p-12238-kdc-155u-kenwood-in-dash-cdmp3-stereo-receiver.aspx