So it's a built-up version of this frame, correct? With the little "brain" on the left side of the rear triangle?
That's a sick setup - it rides like a hardtail until you hit a bump, then gulps the bump. The Minute 3 fork is also nice, and you can adjust the travel down a bit if you think 130mm is too much. The XTR rear is nice, the Deore front is meh not bad (sure it's not LX or XT?) but out of place on this frame.
What kind of rims/hubs? What kind of cranks? How about saddle and post? If those are all high-end items, it's worth the $1500. If they're Deore level, especially the wheelset, lowball him.
I'm biased toward the Enduro.