Can't go wrong with Flos 30s - they're dirt cheap for rims, and while a bit more than the Kinlins you do get the knowledge that thy were very well designed. Depends on your purpose though - if you're looking for cheap, strong training wheels Kinlins are great and bulletproof. The new AForce rims look intriguing too, though I have no experience with them.
Bikehubstore is the only place I'll go for spokes and hubs. I was one of their first customers about 8 years ago, and the first set of hubs I ever bought from them is still going strong. 8+ year longevity and light weight.... I see no reason to ever spend more!
For wheelbuilding resources, I learned from the website of the late Sheldon Brown:
http://www.sheldonbrown.com/wheelbuild.html Should have everything you need.
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MS: Exercise Science
Your speed matters a lot, sometimes you need to be very fast, where sometimes you need to breakdown your speed.