You can get a rear wheel build with Hope Pro2 SS/Trial hub, DT competion spokes, and something like a Mavic TN719 at Chain Reaction Cycles for about $300. $192 for SS hub ($178 if you wanted to go with the geared hub), $38 for the spokes, and $50 to $70 for the rim and free shipping. Their 29er wheelbuild process is kind of goofy since they don't show custom 29er wheelsets on their website. They ask you to put all your parts (hub, spokes, and rim) in the shopping cart and put under "additional instructions" that you want them to build the wheel. There is a small but reasonable charge to build the wheel.
Here is the email i received from CRC about 29er wheelbuild:
"We can build almost any combination of hubs, spokes and rims you like, even if the options are not listed in the custom build section. You need to add all the parts to your basket separately and make a note in 'Additional Information' saying "BUILD WHEELS". In addition, send us an email with your order number so we can check it has processed properly. For 29" custom builds there is a labour charge of £15 per single wheel."
Good luck.