I started on PokerStars a week ago (I'm not a new player, just hadn't played PS) with $25. I only get to play a couple of SNG's each night. I started in the 5's and moved up from there to the 10's and now play the 20's. I didn't notice much of a difference between the 5's and 10's. Between the 10's and 20's there is a slight difference.... you have to actually play a few hands of poker, rather than waiting for monsters and getting paid.