JVC KD-R730BT (KDR730BT) MP3/USB Car Stereo w/ Pandora Control
top end of budget i know but you can hide your ipod in the glove compartment and still hook up what ever to the front. Also basically any aftermarket Hu can get the steering wheel controls but the adapter is 55 Axxess ASWC Universal Steering Wheel Control Interface

as for the amp if you can get the model number off of it i can find you the specs