are you going to buy a prebuilt system or you are going to buy components separately and assemble it yourself ???
For your budget you could check out the AMD Phenom II X2 550...It has better performance than the E7400...and as for the graphics card, I would suggest you get the HD 4670 and the reason is that it doesnt require separate power connectors and so any decent quality 400W power supply would be suffice...
I wouldn't bother with getting either the 3.1 Ghz Phenom II X2 550 (a dual core CPU) or the 2.8 Ghz Phenom II X3 720 (a triple core CPU) right now and I'll tell you why.
Because you can get a 3.2 Ghz Phenom II X4 955 (a quad core CPU) and a MSI motherboard (looks like a good budget one with good reviews) on sale right now.
This would make a powerful budget system.
Getting this motherboard and the Phenom II X2 550 would only save you $35 over at newegg.
Getting this motherboard and the Phenom II X3 720 would only save you $15 over at newegg.
Why get the 720 or the 550 when the Quad Core 955 is practically the same price.
The Phenom II X2 550 is basically a Phenom II X4 955 with 2 cores deactivated and slower by .1 Ghz.
@rider assuming that you have not included any monitor, other accessories, OS in the 30K budget, here is a config that you can check out...
Phenom II X3 720 - Around Rs. 7600
Mobo - ASUS 740G mobo - Around Rs 3000
RAM - DDR2 800 4GB - Around Rs. 3000
HDD - WD / Seagate 7200.12 500GB - Around Rs.3000
CASE - Any good quality case - Around Rs.1500
Power supply - Though you might get cheapo power-supplies, I suggest you spend around Rs. 3000 and get the Corsair 400CX or the Antec EA380....
Graphics card - HD 4850 - Max - Rs. 7000
Total - Rs. 28000
The prices are taken from various Indian hardware stores websites like www.deltapage.com, www.theitwares.com
So as it is around Rs 28000 there, you should be able to get it within 30K in your place...Check out which is the main computer hardware Hub in your city and get your components from there...they should be of the same price...