I've had an I7 for 2 years now, it's a great processor. Same amount of RAM, but i think mine is at 1600. My video card is a 570 if i remember correctly, so it doesn't perform as well as I'd like it with Shogun 2 max graphics.

For mods, I'd say Stainless Steel, Third Age Total War and probably single-player Broken Crescent.