pretty much anything you put in will require cutting of some plastic and removal of a small metal brace behind the dash (not a big deal tho).
alot of people seem to like the pioneer avic -d3, the price is right, but i don't care for pioneers gps (personal thing) and giving up the only disc slot for maps would piss me off, I'm looking at the kenwood 7100 and 7120, If i can get some extra cash together i would opt for an eclipse, killer quality and i like the software (same as in toyota and lexus)
bottom line go to a store and try them out, see what you like!
H/U: Pioneer Premier 880
Front stage: Zapco Reference components
Low End: Image Dynamics
Power by Zapco DC Reference