SnGS IMO are the best way to build a bankroll, but they are just soooo boring. I built my first roll up at Stars SnGs after donating a bunch at
titan 
. They are great, but their lowest 10 person is 3.40 which if you have a 100 dollar roll is the best place to start IMO. Even 50 if you're decent, but if you're still learning you could easily lose that fast..