I would suggest you to buy ZOTAC 750 Ti 2gb.
It is fine and consumes less electricity than Sapphire AMD/ATI Radeon R7 260 X 2 GB DDR5 and price is also same.
You may purchase Seasonic S12Ii 520 watt which is much better than CoolerMaster 460W Extreme Power Plus and would cost u around 4500/- and cabinet should Cooler Master Elite 371 which is very nice in every sense.
You should purchase DH77KC (intel original motherboard) It will cost u around 7K, i am using it and it is fantastic.For cabinet you can consider Coolermaster Elite 371 it is very airy and comfortable to all components and also having USB3 port in front side. Asus P8H77-M LE has only Maximum 16...
I would suggest u to tell your friend to bring GTX 650 Ti 2 GB (ZOTAC) this will be much better than 777O HD.PSU should be S12ii Seasonic 520 watt. it will cost u around 4000/- This is best PSU till date.