2k to 5k is Australlian.. right?
Honestly, I'm clueless with Australlian and stuff, so I'll give this a try.
First, I say you get a Q6600 now, and if you need to later, you can upgrade granted that the motherboard will support 45nm processors.
For a motherboard, Gigabyte GA-P35-DS3R
Videocard, I would either get an 8800gtx now or wait out the G92.. but not sure how long you're going to wait for that, so I say stick with the 8800gtx for now.. and personally, I don't heavilly weigh claims that say like "product x is gonna be 34939293 times faster than product x".. they usually aren't the most reliable claims.
Memory.. Hrmm.. the problem is, if you get 4gb, you have to use a 64 bit operating system, and to be totally honest, I'm not sure how well they run with certain games, although I think support for them is better. So let's go with 2x2gb.. the only pair on Altech was a pair of Corsairs (which I don't really like, they use PROMOS chips if I remember correctly.) Corsair TWIN2X4096-6400C5 4GB (2x XMS2 2GB) PC-6400 (800MHz) DDR2 RAM - I don't think buying DDR3 is worth it now, or will it ever have a substantial performance gain over DDR2, so there really isn't anything wrong with buying DDR2 while it's cheap.
Harddrive is a personal question. I know some people who could use up 160gbs in a week, others who would never reach half of that, so whatever fits into your budget works. I recommend either Seagate Caviars or Samsung Spinpoints. Also, if you are interested and have extra money and aren't interested in RAID, then buying a 10k Raptor could be an option. Make sure your harddrives are SATA2.
Powersupply, get the Corsair HX520. Awesome PSU, modular, quiet, stable, high efficiency... etc.
Case, your preference. Personally, from that site, I would get the Antec P182.
DVD player, assuming you don't already have one.. just get any SATA2 one I guess.. I couldn't find them on the site.
Heatsink.. get an Ultima-90..
Sound card, I guess you could get...X-Fi XtremeGamer.. if you want..
That leaves speakers, keyboard, mouse, monitor.. if you need any of those..
I didn't add up the prices or anything though, just a rough estimate.. I could be way off considering I've never shopped at that place before.
None.