I've come across this unit:
PAC OEM-1. It seems as if it will let me integrate the empeg with my factory system and still even keep my rear radio controls. Cost is $40 shipped from audiowarehouse and affsave, $80 + shipping from tunetown. I believe Custom Sound sells the same thing here in town for $60.

Here's the manufacturer's catalogue:
http://carsound.com/freelit/paccatalog.pdf

Here are the places I've found that sell it:
http://www.tune-town.com/Cars/stuff/pac_oem1.htm
http://www.audiowarehouse.peachhost.com/ct_Pr338.htm
http://www.affsave.com/pac.htm

If this is the right thing, I think I could probably do the install myself, all I need to find is a kit, wiring harness, antenna extender, DIN removal tool, crimp tool and connectors... and maybe some other stuff I havent thought of...

-Biscuits