I probably wouldn't feel comfortable with modern cars using a cheap Chinese deck, too much gets tied in to that nowadays, and decent ones aren't too spendy.
Enough goes wrong with cars without messing up the electronics. But I'm also really not a car guy. Decent radio we put in my mom's car was only around $90
If you do it right you get a wiring harness, you attach that to the bare leads on the radio, and it just gives you a plug specific for your car. If you do it wrong, you just attach it straight to the car, no nice plug to unplug for the next stereo.
