hi, i recently bought a new khs dh50 frame off of ebay, and i need some help choosing components for it. i will use the bike mainly for freeriding, and jumping. i think im gona go with hayes disk bakes, and i already have a fork that will work for a while(im on a budget). i want a single speed crank, and 9 speed in the back. i was looking at truvativ cranks on jensonusa.com, and ive made a descision on which ones im getting, and also im gona get a raceface downhill bottom bracket. so now i need to decide on a head set(i want sealed bearings), shifter, and the rear derailleur. i was thinking about getting sram gearing. so i guess i just need to make a decision on a head set. also i would be happy if someone could give me a link to a site with good prices, and a large selection.
also, what are the differences between head sets? i was looking at my brothers bike and his head set seems to be sitting down inside a little, rather than my current bike, which the head set seems to fit over the head tube. thanks for any help, or knowledge about the frame.