I have just read the great responses from people below on which hub to use. I too decided on XTs (I found some older models which are said to be stonger). It was nice that Sheldon Brown confirmed my choice.
Now I have to decide on rims. I'm a very heavy/tall rider (295, 6'5") who is building up a touring bike on 700 rims. I have used Suns in the past with good results (Rynos and Ryno Lites) on a MTB bike. The Velocity name keeps coming up, but a wheel builder guy I know does not like the lack of eyelets.
Any ideas? Thanks for the great advice.