Ok I mentioned full Details now :-
Intel i3 540 processor , HIS H55L Motherboard, 2 GB DDR3 RAM , 500GB HDD, LG W1943S LCD, Zebronic Anchor ATX with 450w PSU, Microsoft Keyboard+Mouse 500 model, and I live in New Mumbai. My budget is till 3500/- . please suggest good one
cpu, motherboard, hdd - good.
ram - could use another 2gb at least. gta 4 likes cpu cores and ram.
psu - the zebronics psu should be changed. psus like corsair cx 430 v2 can support a decent gaming gfx card up to radeon hd 6850. http://www.theitdepot.com/details-Corsair+Builder+Series+CX430+V2+430W+Power+Supply+(CMPSU-430CXV2)_C14P11114.html
the rest looks okay.
after you upgrade you psu,
gfx card - imo your gaming gfx card's budget is too low. even cards like radeon hd 5570, 5670 cost over 4000 inr at theitdepot.com. the cards under your budget limit are radeon hd 6450 - not really good for gaming. it's a good htpc card, good for watching videos and basic stuff.http://www.theitdepot.com/details-HIS+Radeon+HD5670+IceQ+1GB+DDR3+ATI+PCI+E+Graphic+Card+(H567QR1G)_C45P13308.htmlhttp://www.theitdepot.com/details-Msi+Radeon+HD6670+1GB+DDR5+ATI+PCI+E+Graphics+Card+(R6670-MD1GD5)_C45P10555.html
check with your local retailer/computer shop for latest prices if possible. for your monitor, cards with 5570, 5670, 6570, 6670 are good. costlier cards with 6770 or 6790 would be even better but they seem to be out of your budget range.