Hola,
I'm building my first pc and I wanted yout input, I've found your site very helpful and informative

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I live south of the border, Mexico to be exact, so components are hard to come by (any help appreciated) and I want a machine capable of gaming (mostly RTS like starcraft 2 and FPS like Battlefield 3), Rhino, CATIA and Autocad (in that order). Heres a list of the components I've chosen, I'll list prices in USD to give you an idea of the price difference. Also I would like to do overclocking on the CPU and, in the future, upgrade the GPU or SLI it.
CPU: Intel 2500k $231.66 USD
Motherboard: Gigabyte GA-Z77X-UD3H $167.37
RAM: 8Gb DDR3 Corsair Vengeance 1600MHz $62.52
GPU: Gigabyte nVidia 560Ti OC 1Gb $281.00
HDD: WD 1.5Tb 64Mb cache 7200rpm $130.15
Case: Coolermaster Elite 430 $59.00
PSU:Thermaltake Ttr 2 650w $113.24
Heatsink: Coolermaster Hyper 212 EVO $44.60
Total: $1085.80 USD
I appreciate any help or input, as I said, I liked a lot the level of knowledge and experience you show guys and I know you will be very helpful to me (also you'll like the challenge of building a good mid-range pc with limited components and inflated prices)