Valid point above in regards to Pokerstars having more super micro buyins to play in.. BUT (a big BUT) they are sooooo fishy that it is pathetic. Even Pokerstars buyins up to the $10 level are really bad (although the $10's aren't really bad). Sng's or MTT's at $3 & under on Pokerstars are soooooo bad that they might have you tossing your computer out the window.
My honest opinion,.. be prepared to put down a bigger deposit (I would suggest a minimum of $200,.. preferably more like $500, if you're actually hoping to build a roll on the site) so that you can be rolled to play on some tables with some decent play on them.
When I started out I chose to deposit $175 on Fulltilt & $150 on Pokerstars. It wasn't nearly enough because I was stuck grinding the micros for too long (personally I would never play a buyin for more than 2% of my roll, unless I managed to satellite up into something bigger).
I got kinda lucky on my first night on Fulltilt and took 2nd in the Ferguson for $114 so this helped out a bit but still kept me in the cheapies. I also managed to score a few hundred from private
freerolls which also helped out a bunch.
If I had it to do over again,.. I'd deposit more in the first place and then go get my
hands on a few good
poker books and try to specialize in one particular game (ie. sngs or mtts, or cashtables). I chose a bit of all of the above, lol. For example,.. if it's sngs you want to take a shot at,... try reading Collin Moshmann's SNG book and then stick to the 9plyr. tables and just keep working away on it. I made the mistake of jumping from 9 to 18 to 45plyr games,... which was fun, enjoyable, etc.,.. but wasn't really a 'winning' proposition for me.
Since specializing in one form of poker at a time, my results have come around considerably (be it mtt, sng or what have you). Make one decent-sized deposit,.. find your niche and stick with it for awhile and you'll never have to deposit again (at least I'm assuming that might be one's goals... it was my goal anyways).
I remember how I chose how much to deposit. I was playing on my girlfriend's Pogo account NLHE and was amassing the tokens there for her. I told myself, Okay,. if I can win 10 of 10 I will deposit $500, 9 of 10 - $400, 8 of 10 $300. I didn't really expect to win 8.. but I did, lol. I wouldn't suggest to follow this same method, lol.