It sounds like that you don't really need a 128 MB m10 or the 3.2 Ghz w/ HT - I mean, light games + typical office apps don't exactly need that much power. Heck, I think most hardcore gamers would be satisfied w/ a 1.7 Ghz Centrino w/ a 64MB m10 for most of today's games.
The Compaq x1000/HP zt3000 is a good system; looks nice, light, fairly long battery life, inexpensive - but is crippled w/ a m9 GPU (it was advertised as a m9+, apparently, and debunked...the www.x1000forums.com
has all the details). My roommate's happy with his x1000, although you really shouldn't look to play games high-res. on it.
The Dell Inspiron 8600 is a really good gaming machine, as long as <ahem> you get a good one. Note that the m10 in the 8600 is clocked lower
than m10's in comparable notebooks, and you really have to control the CPU speed + fan speed to get the battery life you want and not have the fans whir on at annoyingly high speeds.
If you're going to get a notebook from cyberpower/ibuypower, try ABS (abspc.com). They have similar configs at a lower price and better customer service. I just ordered one from them this Fri. and got free rushed build + a $50 student discount. I called in, and the guy seemed pretty knowledgable about what they had and the parts they had to offer. I'll post a review once I get the laptop, but so far it's been a good experience.