Get the first one, the Acer. It's faster for gaming, and for LCD's, the native resolution for almost all LCD's 17" and 19" is 1280x1024. For most 15" LCD's it's 1024x768. There are a few LCD's with 1600x1200, but they're hard to come across. 1280x1024 is a good resolution for gaming, so you should be fine with that.