I have the Pioneer xxx-5000 UB and am very happy. you'll need a wiring harness and antennae adaptor. Look at Crutchfield.com-they recently had that unit on sale, and getting the instructions and adapters included makes for an easy install. Fits perfectly-just paint the trim ring silver to match!

The removal tools are even provided.

There's a pic in my gallery.

You won't need any other adapters-it just slips right in.