Isn't ASUS P5 KPL a better mobo
1) gigabit ethernet (945 has 10/100)
2) DDR2800 support (945 has 667 max)
3) 1333Mhz FSB (945 has 1066Mhz)
4) GMA 3100 onboard graphics (945 has GMA 950)
All this for just another 500 bucks more.
Moreover, I don't think you need to buy a PSU worth 1.2k for this basic config. A mercury cabinet worth 1.2k that comes with 400W PSU is more than enough.
Processor: E2160 (around 2.5k)
Mobo: ASUS P5k PL or Intel DG31PR (around 3.5k)
RAM: 1gig DDR2 800Mhz (Rs. 1100)
HDD: 250gig sata2 seagate or Western Digital : Rs.2,200
Mercury cabinet with SMPS: 1.2k
Logitech/MS keyboard and mouse: Rs.700
Samsung/Sony DVD writer: Rs.1200
Price for this: 12,400 approx.
Display, speakers and UPS: your choice.
btw, if you never ever assembled a system before, better get it assembled at the dealer's store. In bangalore, this is done for free at SP Road. Watch and then you can do further R&D. Do NOT try it on your own if you have no idea how to do it.
20k config:
1) E7200 Rs. 5.5k
2) INTEL DG33FB: Rs.5.5k
Rest is the same.