New radio head unit - recommendations?

[BigLion]

Well it's nearly time for Santa to come by, and I just happened across one auction on eBay that looks like a good price for the amount of features...

BMW E39 E53 M5 7" Car GPS Sat NAV 1 Din DVD Stereo Player iPod Bluetooth Touch | eBay

I have some nasty burn spots on my Boardmonitor and frankly, am not getting much use out of the tape player in my 2006 iS (although I did do the BMW Aux retrofit), so why not upgrade and get touchscreen, iPod control, DVD player, micro-SD/ memory slots etc...

Any advice for a noob about which brand has a good all-round head-unit?


(I should add, one that I can just wire in - won't be up for fiddling with blanking plates or adapters or anything)