Welcome. I have rewritten your post so you are more likely to get responses and moved it to the Proposed Setup section.
"1. I have an amp system with a sub box that has (3) 12" x 750watts each the amps are sound stream (2) 1600 watts for subs and (4) 600 watts for mids and highs.
2. I would like to run very fast pc such as the Intel DH57JG Mini ITX iH57 LGA1156 Socket Motherboard.
3. For a processor, I was thinking about an I5 core with 4gigs ram 500gig hard drive windows 7.
4. I would like the following: to hook up to my steering controls
5. bluetooth for cell phone
7. Hd radio
9. For power, I am looking at the M4-ATX 250W Intelligent DC-DC PSU
10 Screen - I'm looking for a good 10.4 inch open frame screen. I found this Open Frame LCD Touch Screen Monitor Revosys XRS 10.4 Inch. [insert link here]
What do you all think of this system? Particularly how I would connect the steering wheel controls and the quality of the monitor?"