There is no need for Graphics card unless you want to play games. Cpu has them built in these days. ( btw gpu memory is not its main performance feature, 1gb 2gb are all marketing gimmicks)
Processor - Most important. Get intel only. Single thread amd is very far behind. Prefer 4th gen Intel (Haswell - iX-4xxx) . There is not much diff with previous generations.
Options - i3-4130 (Rs 7250 Flipkart ), Pentium G2030 (Rs 3370). I think even pentium may be enough if you are regular desktop user. But can consider i3 for more power.
Motherboard - Compatible with Haswell - LGA 1150. Depends on what you want. If you dont need too many connection options ( hard disk slots, ram slots, pci slots etc ), then go for H81 chipsets ( ~3.5k) else B85 should be enough (~5.5k). Best you check features youself before deciding
RAM - Depends on how you use. Even 4gb will be enough i think if you dont load too much data. You can check you existing usage and then decide. 8 GB should be more than enough. Get any cheap ddr3 ram 1333 (or more) . Get atleast two sticks but make sure they are same ( have to be compatible). Ram speed should not matter much for cpu performance. May have some impact on igpu performance for games.
Powersupply - Dont skimp on power supply. Dont get those that come with cheap cases. Seasonic is best - they use good parts. Seasonic ECO 400 / Seasonic SS400BT PSU should be enough ( 2.4k )
