200-300 u probably wont get a disc changer player , try pioneer lowest end model..i think its 1050..but i dunno what's the price for that model. Don't get brand like jvc..jvc low end model doesn't have much of a quality

im not sure about sony. Previous sony models are having problem reading low quality disc (pirated disc), but heck, they might improve on this issue..i'm not sure

Don't really recommend you to buy from brothers..their installation sucks big time. If you could increase a bit..perhaps kenwood 4039 or 5039 would be okay. Just remember when buying mp3 HU, make sure its plug and play type. Some HU requires some kind of adapter..which is stupid and unnecessary for me