realskiers

Your dream wheelset will cost more than your bike, however, Josh 

A friend of mine (just moved back from Northern, VT in fact) has a pro sponsorship from Enve and loves their rims.  I'd love them, too....but I'd also like to stay married and have to forgo 2500.00 mountain wheel sets!  I'm happy with my 'ghetto' Stans Flow 29er rims laced to Hope Hubs by the one and only Dave Thomas (no, not of Wendy's) of Speedream wheels.  Best builder in the business.

I think I would only want to upgrade the wheel set from the giant brand on the trance.   Though, I do like a 20mm thru axle over the 15mm as well (and I have long preferred the better Rock Shock forks to the unserviceable Fox Forks).  For me, Drive train bits are drive train bits, doubles/ single/ xo, xt, xx...sure some are nicer than others, but matter very little in the long run.  The key to a great bike is Wheels, tires, a Frame and a Fork the rest is just window dressing.

Though...the XX1 is another exciting (if pricey) option, I think I can wait for that to trickle down to the XO and X9 levels before buying in.