right there is about as close to specs as I could find. you kind of limit yourself with the touch screen.
1. Is their a reputable builder that can provide something similar to listed configuration above for around $1,600?
2. Is their a reputable website or place that you can order the parts from to build your own laptop from screen ,case, and components (MB,CPU,GPU,MEM,etc)? And have you used them before?
^nope not going to happen, laptops are not like desktops you can just buy the parts you wont and build your own. Really its what you buy is what you get, even changing the cpu can be a pain in the butt. for a laptop about all you can do is add more ram and change out the harddrive.
3. Would the 860M let you play Crysis in Ultramode?
^not a clue they aren't even out yet.