Okay I deserve the best answer for this
x2 550BE- Rs4900
Asus m4a785td - Around Rs7000
1TB HDD- RS4500-5000
ATI HD5770- RS9500-10000
Get LG W2043T or Samsung 2033SW Monitor(Both 20 inches) For Rs 6550.(I bought the LG 15 days ago from CE
You'll need a DVI cable too.Which is not included with the monitor.Costs Rs300.
Dunno about the Crosshair 3 but it should cost more than m4a785.