Not sure if MacBook is for you. If you don't need laptop (i.e. smaller screen), I would suggest the iMac, either 17 inch or larger....excellent value. If you don't need WinXp, the standard configuration is more than enough, although for photoshop, more ram is always better.
Upcoming MacWorld, unlikely any updates for MacBook or MacBook Pro but as others posted, if you're not in a rush, wait it out.
If you do plan to install WinXp, go to thread that is titled '$1000 laptop' and read my post on suggested reading, eBook on various alternatives (bootcamp, parallels, VMare), etc.
UPS just rang the doorbell to deliver new MacBook - but it's for one of my staff who is making the plunge to the light side and I promised to set things up for him. So plan on having some some fun next few days ( i have G4powerbook, G3iBook and G3iMac but all several yrs old and waiting for possible 12" macbook pro in spring????)- although do not plan to install WinXp just yet. Want him to learn Mac OS - for his needs, I don't see reason for him to ever go back to WinXP, etc.
Happy Holidays to all.