[EricH]

Week 4: San Diego.
Here's why: It's a first year regional with a lot of good teams attending. Two former national/world champions are planning to be there, along with Team San Diego's 12 (or more--that's last year's number) teams. In addition to being able to warm up (hopefully), you will see about half of southern California's teams in one place--the only way to see more is the L.A. Regional (week 2).
Expected top teams (no particular order): 294 and 330 (former champs), 968, 980, 599, 812, 696, 368. Throw in about 10 rookies and a bunch of other teams and you're all set.