To be frank you have selected the worst choice of hardware you could.
Amd 64 3500 Venice : Rs.5700 (if you don't have the money then Amd 64 3000 Venice for around 4500)
3200 costs 5200
Asus A8N E :should be around 5500 or so
Corsair TwinX is expensive and won't give you much if at all boost in games, also 1GB is less, get atleast 2GB, corsair value select isn't supported with this motherboard, get:
2 X 1GB DDR 400 Transcend (UCCC chips, if these are not avaialble then get Hynix D43 chips) : 7.8k and up, 8-9k, higher in expensive places
X800GTO is extinct.
Get Geforce 7600GT for around 11k which is better in every way
7600GS should compete a X800GTO(only unmodded version) at stock and comes for around 7000
get a combo drive which is just about 100 bucks more over a dvd rom, combo cost sub 1500
SL series is out dated.
To power this system get atleast a 400 watts quality PSU.
Cooler master 450 or Antec SP(2) 450, both of these will come sub 4k.
If you want to overclock a lot and leave room for upgradation a better PSU might help.
try to get atleast a 7900GT