Wait until after Christmas, definately.
As for suggestions:
- Any ThinkPad
- Any MacBook Pro
- Or if you feel like surrending to conformity, a Dell Latitude (or whatever they're calling their enterprise-class laptops now)
- Nothing where the case is made of plastic
If your laptop isn't your main machine, why not go with something more portable than a 'regular' 14" laptop (a 12" or smaller ultralight thinkpad comes to mind). I also strongly recommend buying a docking station.
I don't recommend TabletPCs anymore; Slates are impractical for general-purpose computing, and the premium for a convertable is too much for little gain (no really... unless you want Wacom Cintiq-like computing it isn't worth it; handwriting recognition's a pain, OneNote isn't really that responsive, and it adds weight and power-draw.