Alright pal,
Build your system with this config
AMD Athlon 64 3500+ -----
AFAIK this wont cost you more than 21 to 14k
Asus- A8N-E
2*512MB DDR 400 Twinmos Ram
250GB seagate SATA
LOGITECH MX DUO WIRELESS KEYBOARD
Microtech 800VA 2 batteries model(believe me man it good and offer moe back up time and also costs you around Rs.2400/-)
XFX/Leadtek/BIG 6800GT or 7800GT(This will surely come for 3 yrs man)
Samsung 19"957MB
Antec Smart power 2.0 450W/True power 2.0 480W
Antec/ coolermaster Cabinet(See to that it has two 120mm or atleast one 120mm.
and rest as you wish. Also tell whether you are going to overclock this kid.