If you have V brakes you dont need 6 bolt hubs, I guess you could upgrade later, the 6 bolt hubs you mentioned are for disc brakes. They will work for your setup as long as the rims are sun rhyno lites. A 9sp hub will also hold an 8 sp hub.Darrell said:
If you want something that will last, you need to spend a little more and consider getting some handmade wheels. 36 spoke wheels are great for heavier riders like us but not necessary most times. I am 215# and run 28spk front and 32 hole rear. You would do well with a 32 f and 36 rear but depends on how aggresive you ride. I broke a lot of cheap machine made wheels before I started building my own. Now I only break one a year, and its usually the rim that fails or me crashing into a tree....You need a rim that weighs 450g+. The liter rims dont hold up to well for big folks. Try the mavic f519 rim, Shimano XT or Hope XC hubs and Wheelsmith DB spokes 14/15.