Frankly, if your primary applications are 'Office' then the added resolution may be a slight disadvantage unless you have excellent eyes or plan on attaching the laptop to an external monitor. I you are using applications that have tons of palettes or controls (such as Visio or Rational) then maybe the res is worth it.

I have a T30 at 1024x768 (14" screen) but the current issue laptop in my office is the T41. Loads of my colleagues have this and I've not heard anyone complain about the screen res being to low for their taste.

Screen resolution aside, get the larger hard disk! Personally, I'm something of an electronic pack rat. It's great to always have reference material at hand from previous projects or engagements. IMO, it's better to have too much storage than too little.