Happy Birthday, Bro! I turned 30 in January (I only cried a little, I swear). I woke up with grey hair, back and knee pain, and now I have to pee twice an hour.
I'm kidding, of course. So far 30 has been pretty good to me.
Other than the obvious "smoke what you like and like what you smoke", I'd say figure out how much time you have and what you'll be doing for your birthday and where. I love the Anejo Sharks (smoked one on my birthday, in fact). But it's a good, solid 90-120 minute smoke. I was out of town, alone (freaking work) with not much else to do. So that and a glass or two of bourbon was great. If you're in a hurry, find something smaller. If you'll be with other people who smoke, find something you don't mind sharing. A smoke with good friends is hard to beat.
As I've learned through years of cigars, it's less about the cigar and more about the mindset. (that said - don't smoke a Gurkha!!).