the case is not the cpu .....cpu is a small chip fitted in your board......
well your budget is really low 29k for a gaming pc.....
cpu..... fx 4300 (5898/-).....http://www.flipkart.com/amd-4-ghz-am3-fx-4300-fx-series-four-core-fd4300wmhkbox-processor/p/itmdhtnufz8f2z49?pid=PSRDHTNMABMMZEYQ&otracker=from-search&srno=p_1&query=fx+4300&ref=755a0df5-b7aa-4bd5-bfbb-d49b48dff9f3
motherboard.....gigabyte (2870/-)......http://www.flipkart.com/gigabyte-ga-78lmt-s2-motherboard/p/itmdhack3xs3qc96?pid=MBDDHACK3XS3QC96&otracker=from-search&srno=t_4&query=am3&ref=9969866e-a2e0-430b-afab-88eac9804b05
RAM 4gb........ transend 1333mhz(2799/-)........http://www.flipkart.com/transcend-ddr3-1333-ddr3-4-gb-pc-ram-jm1333kln-4g/p/itmd2rypzczsv8e7?pid=RAMD2RYPSWYFFUSM&otracker=from-search&srno=t_3&query=ram+&ref=a8bba86c-82b1-41a4-a859-2416f9473fb4
HDD .......WD Blue 500gb(2950/-)...........http://www.flipkart.com/wd-blue-500-gb-laptop-internal-hard-drive-wd5000bpvt-wd5000lpvx/p/itmd5kd6kav9wdse?pid=IHDD5KD6KAV9WDSE&otracker=from-search&srno=t_3&query=internal+hd&ref=f45e8511-ae39-45e4-ab73-cc1e6589a1f6
PSU......corsair vs 450(2279/-).........http://www.flipkart.com/search?q=vs+450&as=off&as-show=off&otracker=start
GPU......r7 260x(9399/-).........http://www.flipkart.com/sapphire-amd-ati-radeon-r7-260-x-2-gb-ddr5-graphics-card/p/itmdr9mdgjg2ph6c?pid=GRCDR9MDGJG2PH6C&otracker=from-search&srno=t_1&query=r7+260x&ref=e3aad337-ad68-40a0-b5df-d2383dc16595
case......coolermaster elite 311.......http://www.flipkart.com/cooler-master-elite-311-mid-tower-cabinet/p/itmd5xzy42kvyszt?pid=CABD6GATEK4UXXSQ&otracker=from-search&srno=t_1&query=cabinet&ref=e004eab9-67da-4e4e-ab11-530bc9846bc6
TOTAL......28687/-
this is the best i can give u for your budget you will still able to play modern games with medium to high settings.....