Performance RAMs like XMS and Vengeance will be bottlenecked on this configuration.
1 TB Seagate Barracuda
Any decent HTPC would need 1 TB HDD, at least.
Zotac GTX 550 Ti
A very capable Mid rang graphics card. Any 550 Ti chipset based card will do.
FPS SAGA II 500W
Quite a decent PSU. Never skimp on the power supply. I and many others learnt this the hard way.
CM Elite 361
A relatively low profile case for HTPC. You can choose any case you want.(with decent air flow for your graphics card)
Keyboard + Mouse
Berklin C400 or Logitech MK 220
Any 2.4Ghz wireless combo will do for a HTPC/Gaming PC hybrid. Serious Gamers will notice latency and should go for wired solutions.
This is a quote from online prices. Real world prices will be a bit lower.
To convert this into strictly a HTPC:
Skip the graphics card. As then the GPU built into the die of processor will kick in. But then you can forget about playing any serious games on your PC. This would bring down the cost to Rs 22600. You can then add a graphics card any time you want.