When it comes to pre built systems, you have to look at more than just specs, especially with laptops. Lenovo actually makes all PC's for IBM, it used to be the IBM Thinkpad.
I vote for the Think Pad, it's a more trustworthy name, backed by IBM and Acer's track record, especially on laptops is less than remarkable.
Just make sure to get yourself a correct size laptop cooling pad if you're going to be gaming. It might be bulky but it will save you the hassle of hot palms and a melted GPU (extreme I know) later on.
But will the GT630M be able to render the same frame rates at 1600x900 on the 17.3" display as at 1366x768 on the 15.6" display??? I read that more than 1gb on a graphics card will only be utilized close to HD resolutions...so will i get the same frame rates?? Anyone with experience on this??