I plan to use this for everything, gaming, productivity, household stuff, the whole deal. Gaming is generally the most demanding thing I do on it. Should I upgrade the CPU?
I will probably have 16 GB RAM and dual 2 GB 7970 graphics cards.
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.... You don't need 16GB of RAM for anything you mentioned, 8GB is more than enough for that. As far as the CPU, get the best you can afford, but I will say that laptops for gaming is not a super great idea. A $1000 desktop could own a $4000-5000 "gaming" laptop all day long. The price to performance vs mobility just isn't worth the cost.
Its much more economical to get a fairly competent laptop that can do light gaming on when you're traveling, and put the most money into a desktop rig. Hell, you'd be better off getting a small Travel/LAN style computer case thats portable.
Believe me, I have thought hard about that topic. I have been building my own gaming desktops for over a decade now. But I really hate working between two computers and I need to be able to travel internationally and stay for months at a time. The compressive forces that my luggage undergoes in the belly of the plane and the tender mercies of the baggage crew have shattered wooden hangars; I do not expect a desktop to travel well. If it can't fit in my carry on, I cannot expect it to survive the trip.
I have never tried building a small desktop though...is there a way to achieve a powerful gaming rig that will fit into a carry on, ideally with room to spare?