I don't work with laptops much, beside my own; but, I can tell you that if you intend to use it for gaming, I would avoid mobile-type processors, which are always designed to extend battery use and, consequently, suffer to a lesser or greater extent (depending on the specific processor) in performance.
I would consider only the most powerful desktop-type processor I could afford. Personally, I don't generally use my laptop very far from a wall plug so a high-capacity battery isn't important in my case; but, I got the largest battery anyway. It increased the weight of the unit; but, my laptop is considered a desktop substitute anyway because of its size and weight so a few ounces extra on the battery isn't a big deal.
If gaming were not an issue, I would have made a different recommendation.