Hey
I currently don't have a nxt either but they do sound really intresting.
My school recently purchased 4 of these vex robots and have a club type thing on wednesday. I got to go to the nationals but failed misrebly as the programmer programmed using wrong template so when we hooked up our controllers to the playing area our robot wouldn't move.
http://www.vexrobotics.com/vex-education.shtml