I just bought a single DIN pioneer 5100ub that has two usb ports and an auxiliary input that works really well with the Iphone/Ipod/usb drive/ect. It retails for $209-$229 but found it on amazon during a sale for $160. One USB spot is in the front and one is in the back. I bought a 3' USB extension from monoprice for $1.78 for the rear USB port and ran the cord into the glovebox so that my wife and I can hook both of our iphones up at the same time (or 1 iphone and a usb drive, ect.)
It looks like the similar double DIN receiver from pioneer is shown for about $370 on the pioneer website, but after adding it to my amazon cart it sells for $259.
The Pioneer double DIN model is FH-P8000.
