I think that you really can't go wrong with ANY of the micro level games.

However, I do think that some people might be naturally "wired" for one type of game over another. That's not to say that you can't get good at them all eventually, but that you should try everything for a little while to see where you feel more comfortable.

Also I recommend spending WAAAY too much time reading and thinking about poker instead of spending all of your "poker time" at the tables. This is easier if you have a job with Internet access and lots of down time.