You should wait at least a month, possibly several. The Intel 45nm penryn processors have just been released very recently. They are going to be much more common and much cheaper by mid spring. Beyond that, they claim by summer the Centrino 2 platform will be available to the consumer resulting in better integrated graphics chipsets, more efficient wireless connectivity, and they claim better battery life.
As far as a 17" notebook goes, HP for under $1500 is the way to go. You can get a nice DV9000 series with a dedicated graphics card, 3 gigs of ram, and blueray for $1350.
You will have a lot more options at the 15.4" range. Lenovo are rock solid and offer great options. Dell XPS are solid as well and offer nice features such as a slot loading DVD tray. HP as well offers great notebooks with the DV6000 line. Sony notebooks at the fifteen inch form-factor are decent though you dont want to look at the V series.
If you are looking for extremely small notebooks, 13.3". Sony, Dell XPS, and Lenovo X series are really the way to go. Sony is my personal favorite for this particular size and their Z models have amazing features for the price.