I'm near Goatfeathers Restaurant on 30A. I have the Blackberry Bold 9700 on ATT and I get 5 bars with full 3G coverage. I have the unlimited voice and unlimited data plan. I'm happy with my phone, plan, and coverage.
That said....when my contract expires, I will probably switch to Straight Talk, sold at WalMart. $45/month unlimited voice, data, and texts. Straight Talk uses ATT or Verizon networks, depending on which phone you use. (Easy way to know which is which is if the phone uses a SIM card, it's ATT. No SIM, Verizon.) Straight Talk just started offering the Nokia E71, which would satisfy most Blackberry or other smartphone users. This is a great deal...