WHS Robotics was at the regional my team attended last year, in Sacramento!
I would suggest getting a miter saw. This is useful for cutting aluminum: such as tubing for a frame.
We love our table saw (although we need a new one) and use it regularly for cutting lexan and polycarbonate as well as aluminum plating. It's also been an integral part of constructing our playing field in the past -- cutting lumber -- but the playing field requires much less carpentry this year (much to our relief).
We also have an oscillating, table beltsander which comes in handy sometimes. It wasn't very expensive at all.
Good luck with your new toys!