it's tough to answer otherwise. Your budget will determine just how light of a wheel set you can get. I mean really light wheels are gonna cost you. I could recommend sets that will cost you anywhere from $100 to $350 or more that will easily fill the bill. But the lighter you want them the more it will cost. So what is your budget for the wheel set? Then we can get specific.
The only problem with the link for the disc wheels that Ratt gave you is the price quoted is for ONE wheel only, either front or rear. If you check more carefully the front and rear together will put you over on budget. Depends on how set you are on spending less than 300 on wheels. Anyway, below are some links to Universal Cycles. They have in house specials that they hand build and are very reasonably priced for what you are getting. The first is for Shimano XT hubs laced to various rims, the second is for DT Onyx hubs, and last but not least, Hope XC hubs laced to various rims as well. I presonally have a set of Hope XC hubs laced to Mavic XM719's and love the wheel set. The 719 is a Vbrake rim, but I have them set up for disc. They work very well. But the complete set is over $300. The idea though is that the Hope hubs are excellent. I've had 0 issues with them what so ever and they are extremely easy to service. Anyway take a look at the links and see what you think. There are plenty of quality wheels well within your budget and some that should be quite light as well.
I would suggest a pair of WTB LL hubs with Velocity VXC rims. Mine are 1570 grams actual weight. Try Mike Garcia at oddsandendos.com.
To get some for < $300, you may have to find them used. Very tough wheels IMHO. Also, Larry Mettler at mountainhighcyclery.com can build the same wheel, I believe.
FSA XC 300. Right around $300 or so for the set. Great reviews from MBA and the few reviews on this sight have been good. The 300's are disc specific though. Cambria has the old XC100's for $109. Rim specific, around 1800 grams for the set from what I hear, but don't quote me on that. The new XC 100's are a little heavier and disc/rim. Good luck.
I had a set of these for a while and I thought they were great. They're not the lightest wheelset, but they are strong. Welded seams, machined braking surface. The best thing is that they are compatible with disc or rim brakes and are UST compatible. MSRP is around $229 for a silver set and $259 for all black.
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