I would go for SnG's. First reason is that by playing them i made more than cash games. There are a lot of very bad, and i am serious VERY bad players at the lower limits (i went all in for 10BB and got called with 23o; the dude just wanted to have some fun).
Another thing is you'll be able to play an MTT also so you should definately play some (don't expect to win them, not even cash in them since variance can be huge i guess).
If you are not very experienced you won't miss playing like 16tables... I play 6 sng's without a stretch.
If you really want to make a bankroll i recommend you set a number of SnG's to play (or no. of hours/day). I like to go for minimum 10sngs/day. It isn't a great idea to do that if you are a really bad tilter, but for me it works.
Don't imagine i made a fortune doing this, but played like this the 2$ BI and ended up after a month +35BI because i had a horrible DOWNswing!!! (about 30BI)