I tend to buy games I want... when I want them, I guess. Sometimes it's a few weeks down the line, sometimes I hear it getting praise a year later. When Christmas was a factor, I could always wait for games until then, but these days I just buy them when I feel like it. Price isn't really a factor, it's a bonus at best.
And the only times I buy used is off the shelf at a Gamestop when the game's well old enough or if I make a conscious decision not to support the developer. (I'm buying UMvC3 used as soon as possible, for example)
--
I like how each new topic you make reveals such varied facets of your idiocy. - foolmo
Now this is entertainment!