I agree playing tight at the beginning and gradually loosen up as blinds and antes get bigger. When antes kick in, that's when my raises usually go to min-raises and I've had good results getting everyone to fold, even the big blind, so it's great to pick up not only the blinds but also a table full of antes. When I get down to around 7 x M, that's when I consider myself shortstacked so I go into shove or fold mode, not always, but usually. When the bubble approaches that's when picking up a pot with a raise preflop works the best.