1) If you're not overclocking your CPU, there's no reason to get the k model. Drop down to an i5-2500.
2) 2GB of GPU memory will be wasted on a single display -- you can save $30 by going with a 1GB model.
3) Make sure you choose a reputable brand for your PSU. 600W will be plenty for your system.
Your system should be fine running BF3 and Crysis 2 maxed at 1600x1200.
thanks for replying so soon ultimabeam. Well, i m going for i5-2500k cause its just around 4$ costlier than i5-2500 in my country. Concerning gpu memory- i think 2gb memory will be good in the long run as we are seeing games being relased with min 512 mb gpu memory requirement now itself and the psu is of coolermaster brand.
Will the motherboard that i specified degrade performance of cpu or gpu?
and please suggest a cabinet for this config in price range of 40$-50$..