I turned completely to used hardware and have been buying as low as possible, mining while listing, and selling it to make more and buy better hardware. In just under a month I'll be up to 600GH, with a $3500 investment and turning around hardware. Preorders are great if you are already sitting on a farm, but to the newb buying in without enough cash, smart plays on smaller hardware can still get you in the game for the long run.
That being said, once I have $6k profit, I'll be ordering a prospero x-3 for sure. That seems to be a good preorder to get into if you have the cash/btc on hand right now.
Edit: Meant to quote PenAndPaper up a few posts about not preordering, but left it out.
So what you are saying is to never ever do a preorder. I agree with you.