kinda depends on your price range. Pioneer makes some good units with simple ipod control through usb and a good BT system and can be very affordable if you need it. I personally use Kenwood Excelon in my car and love them. all the options and has more tuning options that I like. I would personally stay away from Sony. Not really impressed with their products.
Get on crutchfield's site and look around on there. find a few that have the features you want and are in your price range. One thing to keep in mind. i you are planning to have a shop install it plan on around $100 or so for parts and labor.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22