Hi there, I think you should just buy it now coz I just bought a current 2.33GHZ mbp and im ever so pleased with it.
I use several computers everyday and I have a Windoze desktop that i customized for gaming (Dual-core geforce SLI etc) that is a hell of a machine but this macbook pro is really very snappy.
I had no dead pixels, the lid shuts perfectly, its not that hot and im just very pleased with it. I had used a Powerbook, iBook, Macbook before buying this and I have to say that all of them had a dead pixel and had some issue or another.
If you WAIT for the newer platform, remember that then youlll encounter that rev A discussion where there will be a new set of problems like possibly whining or heat or whatever, although thats just a possibility. The macbook pros now have gone through more production cycles and have been revised accordingly and is a good time to buy I think.
Hope that helps