Need help picking 1156 vs 1366

APPROXIMATE PURCHASE DATE: I will be coming home from Iraq in mid November so around the first of the month i want the parts there when i get home.

SYSTEM
USAGE FROM MOST TO LEAST IMPORTANT: Gaming, Gaming, oh and more Gaming (COD MW2)

PARTS NOT REQUIRED: Monitors, keyboard mouse

PREFERRED WEBSITE(S) FOR PARTS: newegg don't really know any others with the same great service.

PARTS PREFERENCES: no real preference love asus

OVERCLOCKING: Yes / CROSSFIRE: Yes when i purchase another card

MONITOR RESOLUTION: 2@1280x1024, will be 1680x1050 when i pick up 2 monitors later on.

ADDITIONAL COMMENTS: just looking for some good input on which one will last longer and upgrade easier 1156 or 1366 with price and performance. I only used newegg for the parts if there's other places please let me know. i post a couple weeks back my basic system build i was planning on building untill i read some things about the 2 chipsets and its making me lean towards x58. also HD i know people say the f3 is good but can it perform like the raptor and i dont need space. Will the power supply handle 2 5850's. one reason for the evo instead of the pro is dual nic's i always get a lighting storm to knock 1 or both out on the last 3 boards i have had.

The base build is this

Case - COOLER MASTER Storm Scout

Ram - Mushkin Enhanced Blackline 6GB Model #:998679

Cooler - COOLER MASTER Intel Core i7 compatible V8

Thermal - OCZ OCZTFRZTC Freeze Extreme

HD - Western Digital VelociRaptor 150gb

Video - a 5850 not sure which brand being there sold out all the time i plan on buying another in a couple months

Power - OCZ ModXStream Pro OCZ700MXSP 700W


Now for the differences

1156 build

MOBO - ASUS P7P55D EVO LGA 1156

Chip - i7 860

1366 build

MOBO - ASUS Rampage II Extreme LGA 1366

Chip - i7 920

I am purchasing like i said early next week!! the price difference is $140 after mail in's