that build is no good, the mobo is old, gts 640mb were discontinued along time ago..
asus p5q
4gb reapers
640gb wd
his 4870
q6600
antec 300 case
for 1600 you would be looking at this
if u went the extra 4870 (x48) it would be right on budget. i would advise waiting for the 4970x2 (soon). thats with quality psu. you could eg ta cheaper say bout 80 save a lil but i rec. silverstone they are great. thas the computer i rec. u get, only 1300 after shipping so room to play with dvd drive, card reader etc. and extra 4870 if u will
EDIT: from itsdirect.com.au
asus p5q
4gb reapers
640gb wd
his 4870
q6600
antec 300 case
for 1600 you would be looking at this
if u went the extra 4870 (x48) it would be right on budget. i would advise waiting for the 4970x2 (soon). thats with quality psu. you could eg ta cheaper say bout 80 save a lil but i rec. silverstone they are great. thas the computer i rec. u get, only 1300 after shipping so room to play with dvd drive, card reader etc. and extra 4870 if u will
EDIT: from itsdirect.com.au