Will my cpu bottleneck my gpu

Maybe a bit, but it's still a pretty good match-up

can you suggest me a good psu for my config.

For a system like your I start with the Corsair TX-650 V2. It's a great all around PSU and on sale now at Newegg. If that's too expensive, then I'd drop you to the entry level Corsair unit, the CX-500.

First thing to do is get 4gb or RAM and make sure u are running Vista or wind 7 otherwise no point getting a DX11 card.

Second buy a decent maked PSU, anything 550w above will be fine (7850 is an efficient card) however if you plan to overclock your quad core play it safe and go for at least 600w. If you case has options for more fans get one especially if you are over clocking it.

Third thing...have fun!

Depends on game. But most of the games will run fine without bottleneck.

how about this one

http://www.flipkart.com/seasonic-s12ii-520-watts-psu/p/...

is this good

Its a very good psu and will keep up with your system.