Then get something like. Onyx. I built a wheel for a guy a month ago and we found a super nice deal.
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
Ask them for the matching rear hub, they will sell it for 99 dollars +6.50 to ship. THe retail on onyx is usally much higher. Ive built 2 wheels of that front hub.
Seriously though, get something better than XT. At least Jujus, they are disc ready, and the life expectancy is much longer