I've got the cheapest Sony ($80) with MP3 input jack. 6 1/2" woofers, crossovers and tweeters. Sounds pretty good (some speakers up front would really help though). Currently I have it duct taped on the hump in front of the shifter, not sure where I'll mount it. Bought the cheapest antenna at Autozone ($5) antennae cable extension ($4) and ran it under the carpet and just crammed the extended antennae crosswise under the lip across the rear cockpit trim, up under it. FM reception is fine, AM stinks (needs to be a good clear shot for AM I guess). Antennae is invisible of course. Car is still positive ground. Head is wired straight to the battery, unswitched. Stereo has a setting to turn off after so many minutes (or 30 seconds even) so if I leave it on it won't drain the battery. Certainly not the best way to go but I hate cutting holes in pretty cars.