stereo specifications

Just bought mine, it has an aftermarket stereo in it that is really nice (Fahrenheit 9inch display), but I think I'd rather have a factory stereo instead. I can't control from the steering wheel, which I miss with my 03. How many different kinds of stereo options were there for the 2010's, if...

hey was sup guys i have a 2004 dodge ram w/infinity system ive been looking for a headunit for wks already, but im not too sure how many rca's i need from the stereo, i was thinking 3 cus im adding a mono amp and im wanting the steering wheel controls and the stock amplifier, i know im going to...