AMD Phenom II X3 720 BE = 6350 /-
Asus M4A78-EM-1394 = 4550/-
Corsair VX450/Seasonic PS S12II-500 500W = 4500 /5200 -
Seagate 500 GB = 2400/-
Total = 17800/18500/-
Now u want GFX card ...
I suggest Ati over Nvidia. Right now ATi is best option with new Dx11 5xxx series ...
HD 5770/HD 5850 - 11500/17500/-
Total =29300/36000/-
Ati HD5850 is much much better than GTX275,GTX285 + it support DX11(More future proof than Nvidia), thr4 i suggest it.And their is no Driver issue with ATi, so dont worry.
Check this and then decide :-
http://www.techpowerup.com/reviews/HIS/HD_5850/
And about ur PSU query :-
Corsair VX450 vs CM extreme power 600 (some key differences):
(1) Rated at 50 degrees C vs rated at 25 degrees C
(2) Active PFC (0.99) vs passive PFC
(3) 80%+ efficiency guranteed vs 65-70% roughly.
(4) Hi-Qual Jap caps vs not so Jap caps
(5) Double ball bearing fan vs sleeve bearing fan most prolly
(6) 5 yr warranty vs 2/3 yr warranty (heard that low end CM psu like Extreme power series have only 2yr warranty now.)
(Seasonic also as good as Corsair with 5 years warranty. If u buy 5850 i recommend Seasonic PSU)
Just numbers on paper have nothing to do with the stability and purity of the various o/p signals, etc... which is one of the biggest factors in choosing a psu.
Lower efficiency means higher losses- means even more heat than acceptable for normal operation- means even further drops in power/efficiency- plus greater instability/impurity in o/p
(Further aggravated by lack of proper heatsink/cooling).
And u can find all product at :-
Arihant Infotech
3, BIPLABI ANUKUL CHANDRA STREET ( CHANDNI CHOWK ),
Kolkata - 700072
Mobile: 9331004141
Landline : 22127871 / 22537186
Landmark : Besides Sabir Hotel ( A dirty Dhaba )
Vedant Infosys
4, CHANDNI CHOWK STREET,
Kolkata - 700072
Mobile: 9830653393
Landline : 22127893/22129832
Landmark : 1 minute from Sabir Hotel ( A dirty Dhaba )
Note : You'll find Arihant easily ( but do note there are 3 types of Arihant in Chandni Chowk so please see carefully the name carefully )
Once u find Arihant , there'll be Sabir Hotel besides it
Arihant is at a 4 cross hair junction.
From Arihant turn left from that side of footpath where Arihant is and walk straight till 1 minute and on that side of the path where you're walking there will be Vedant.
Vedant will offer the best price that you can find in Chandni Chowk.
Edit :-
If lucky, u can unlock one core of 720BE with Asus M4A78-EM-1394 mobo ...
My friend unlock 2 cores of 550 BE with this mobo ...