don't use an Asus video card, get a Leadtek from www.msy.com.au
for around $270
drop the Audigy 2, use the onboard sound of the motherboard. the MSI and DFI boards have onboard sound.
get a 3000+ Venice for $200 at msy, and you'll be able to overclock it to 2.8GHZ on stock cooling
you can get the DFI NF4 Ultra-D from www.pccasegear.com.au
for $215 (aus)
and also, with the extra money, try and get G.Skill RAM with Samsund TCCD's, for $355 at pccasegear. that stuff overclocks really well.
the same hard drive is $105 at msy
also, you're going to need a good PSU. a Cooler Master Real Power 450W can be had for $99 at msy. or I'd suggest the Antec 480W for $127
monitor: go to a swap meet and get a 21" CRT second hand, they are usually very good quality and cost about the same as new 19" CRT's (good ones) but they give high resolutions and really high refresh rates
the same DVD burner is $72 at msy
for a mouse and keyboard, get an MX-500, and Logitech Elite keyboard. you won't be disappointed by them.
or if you wish to spend more, the MX-1000 laser mouse is really good. though I'd go with the MX-500, considering the MX-1000's price
speakers: Logitech makes good speakers. the Z-5500's are THE best, however for your money, the X-530's or X-620's are really good.