Be careful on Spicer's. A reputable off-roader friend of mine said that the owner of a driveline shop said that the Spicer's with the blue seals are made in China. Another member in our 4x4 club uses Spicer's exclusively, and has had to replace u-joints in less than a year.
I've heard Neapco U-Joints are fairly decent. They used them when I had both my drive shafts rebuilt a year ago, and so far I haven't had any problems.