At your weight you will be fine, you'll just need to have the rear wheel beefed up a bit. I'd suggest a Velocity Deep-V or a Salsa Delgado Cross rim with DT spokes. Since the stock wheel/hub is a 36h, you can re-use it. I'm one of the resident wheel killers, and I'd have no problems riding such a wheel if I was at that weight. I rode a stock 36h non-handbuilt wheel on a Specialized Hardrock at over that weight, and I was NOT nice to it. Several thousand miles later the single-wall rim finally cracked, but yeah, I'm a 36h convert.
If you have the money, go with a 40h or 48h. But if you don't, 36 will do just fine. See if your LBS can get DT Alpine III spokes in the proper length.