Since this thread doesn't really need any more FIRST star power endorsing hehe, I figure I would throw in the perspective of a college mentor who's been away from the game for a year. Having been away, I can safely say that the regional I look most forward to attending is going to be Waterloo.
The GTR is historic and always a good time, but its something about the PAC in Waterloo, when it actually gets crowded to the rafters and people are yelling and screaming for their teams, way more for them than I'm sure any other team besides the UW Badminton team

gets to hear in the PAC.
Seriously though, for a ton of real fun in a regional that isnt so cavernous and still has the magic of an intimate FIRST event, for the best and most welcoming teams, volunteers, committee members and FANS of FIRST, head to Waterloo this year, I know I will be!