Actually, I started off playing NL ring games, 30k hands of NL25 to be exact. I just decided to diversify after a while and moved to SNGs, then i tried limit, then HU, i even went through a MTT only phase, then omaha, then god knows what, but now i'm wondering why i never stuck to NL the whole time lol
it's definitely the most profitable type of game i've played so far, over the long run that is.