If you truly need one now, buy it now. If you don't, then wait.
Yes, I know about the buzz about a new model, cheaper plastic macbook on the way. You can read rumor sites and drive yourself crazy about the decision to buy now or wait on some new unexpected hotness at a lower price later on. As much as I detest car analogies for tech gear, I have to use one: once you buy almost any car, it will start to depreciate as soon as you drive it off of the lot.
If you truly need a laptop now, and must make a decision about the macbook versus the macbook pro, read the reviews and opinions on each model, and then go to an apple store or best buy and check each out in person. Play some online videos on each in the store and see if you think there's a heat difference between the two. If you make a decision about which one you want, you can buy it at the apple refurb store for a like new system for a tidy discount.
As for black friday discounts, I don't seem to recall anything too spectacular when it comes to macs, usually they've got modest discounts on systems and most other items and one or two good discounts on a handful of items that you may or may not need. Last year, they had the $500 multimedia version of mac for windows for $150, and some laptop theft protection software for half price.
If you do get a new system, get it without regrets. Accept the fact that something newer, faster, better, cooler, and maybe cheaper will always be in the pipeline for a future release. Use your system for as long as it does what you need it to do before you buy a new one.
Good luck with your decision.
