Dell Inspiron 600m v. 700m?

[JEM7VSBL]

I'm going to be purchasing a laptop very soon, and I originally wanted to get an 8600 with the wuxga screen, but realized it would be better for me to get a smaller, more portable laptop and hook it up to an external monitor. it would give me a much wider range of machines to select from, and something that was easy to carry around. i only intend on playing in my room, so getting the uxga screen just doesn't seem practical. now i'm wondering what the primary differences are between the 600m and 700m. the dell website doesn't do a really good job of comparing the two....the only main differences i see are the 700m is slightly smaller and lighter, and has the widescreen, while the 600m's resolution can be upped to sxga...