I have a 17 inch one and its quite heavy, but good resolutions and a full sized keyboard. for portablility 15-15.6 is fine, depends slightly what you will be doing with it. I guess you will use your desktop for gaming. My laptop runs most games, but for gaming a desktop is far better. I use a small netbook (an EEEpc) when travelling, it can't run games but does most other things really well.