Powerbook
Not wishing to start a flame war, but you will be disapointed with the Powerbook if you plan to run Photoshop. I recently bought a 1.5 GHz Powerbook as a mobile platform to complement my PowerMac DP G4s. I held out as long as possible, but had to have something by January 2005.
After six weeks of use, my observations are as follows:
Really crappy display, it's samsung, no surprise
Weak, weak, weak battery - 2.5 hours use max, of course what do you expect from a lucky-goldstar battery.
Runs really hot
Slow
Poor airport extreme
Poor quality workmanship (warped cover, uneven keys, rough speaker openings). Quality of workmanship on my $100 coffee maker far exceeds that on this $2400+ powerbook - AND the coffeemaker turns on a lot faster.
Underpowered and slow - don't expect to do much with Photoshop or Photoshop Elements on a powerbook - it is slow and anemic. If you want mobility with a good display consider SONY or even HP, if you want power consider one of the newer Intel or even AMD setups. If you want a decent price, stay away from the overpriced powerbook.
Excell - forget it if you want to run a large spread sheet.
Again, I do not want to start a flame war - The only reason I bought this thing was to have mobile compatibility with my other apple products - but after struggling with it for the past six weeks, I found it was a mistake. I have been using apple for many many years. But for the price, it is not worth it.
BTW, this thing will not run my Sony 23" Flat Pannel display in 1920X1200 mode, only at much lower resolution.