Look at the Asus @ BB for $650. Amazing battery life, quite thin and mobile, and plenty of power. The HP DV4 @ BB is also decent but doesn't have the battery life of the Asus.

Windows 7 comes out Oct 22 but if you buy now, you won't recieve your free upgrade till Thanksgiving-ish. Trust me, it will be worth the wait if you have had to deal with vista for the past three yearsl.