It looks like you are getting a lot of answers from AgLeader salesmen.

Lots of SRAM cards on eBay,  no problem there.
 

It's funny but when the PF 3000 came out lots of people prefered the YM for non-tech savy operators because it was easier to operate.  At any rate if you can't figure out the YM you are not tech friendly.  

What do you mean by hardware?    If you are starting with a head unit with no sensor package you are a long ways from seeing the whole cost.  The sensors and wiring will cost more then the head does.   The impact sensor is vital to getting an accurate system, and the elevator mount style of moisture sensor is vital to getting it tow work reliably in many crops.