Never used a keypad, although I'd like one, just for show. I suppose one would be good, ergonomically wise, macros at your finger tips without having to reach to the left, and the thumb stick. But I'd still take the keyboard.
I had the PC in the kitchen once, yeah right next to the fridge. That was at my mums house. At the moment I live in a studio flat, my fridge is kinda behind me and my bed is to the right of me.
Mos games aren't too CPU intensive. Most games there will be very little difference between yours and a high end intel. Games like BF4 you might notice an increase in performance with an intel high end, but the majority of the games out there won't utilise your CPU fully.