Very nice start considering you started from nothing. I do think you are playing too high of a buyin for your bankroll though. I do the same thing but it is an occaisional stab (still wrong). You are consistantly buying in too high and it won't take much of a losing steak to break you. Here's an article and a thread on bankroll management. You can also use the search option and find much more on it here at the forum.
How to Build Your Online Poker Bankroll: Where you Should Start (http://www.cardschat.com/build-your-online-poker-bankroll.php)