Fogster and jghunter, I wish you both luck in leaving the analogs behind. You will find a lot of great support here at ECF.
Like Pyrate said, everyone is going to have their own favorite based on personal needs. I would definitely recommend the 510 for a starter, but that doesn't mean others aren't good as well. If you look at the poll that Kent posted above, you will see that the 510 is WAY out ahead of the others. In second (with less than half of the 510 votes) is mods. To me this is a little misleading, as 90% of the 'mods' are just battery mods. So when somebody has voted 'mod' they are still screwing in an atty from one of the other selection. So chances are 30% of those votes are for 510 as well.
But regardless of what model you start with you will most likely buy something else at some point anyway. I would like to see a poll of how many models users own. I would guess most of us have at least 2-3 different models. (I have 7 not counting mods).
And although the 510 is my model of choice I didn't start there, I bought 2 other models before I got my 510s. And even though I think it's the best, I didn't end there either, bought 4 models after it. I just have to try everything that comes out.
I just like to recommend the 510, because I think it is the most likely to impress right out of the box (after charging your batts of course). And it is the most likely to make you and instant 'vaper for life'. If you start out with something wimpy (cough.cough.401.cough) you may think the whole thing is a waste and not even try others.
What I did, was take my cig budget $10/day ($300/month) and buy ecig stuff. The number may be different for you, but chances are, if you spend your cig money on e-cig stuff you will be up to your ears in vaping supplies in no time.
Good luck starting out, and whichever model you get, you can get all the help and info you need to make the most of it here on ECF.