AMD Phenom II X2 955 BE -> 12.5k
Biostar TA790GXB -> 4.5k
Corsair xms2 2GB -> 1.5k
Corsair VX450 -> 4k
Sapphire 4770 -> 7.5k
Zebronics Bijli -> 1k
Total
~31k Advantage :- As X4 955 BE is the best VFM quad core and AM3, you can later upgrade just changing to DDR3 mobo and RAM.
If you are strictly under
30k budget then get CX400 instead of VX450.
If you can increase your budget to 33k then get a Biostar TA790GX AM3 and DDR3 RAM. (with VX450)
P.S. - You may add another 2GB of RAM according to your requirements.