After consultation with Chuck from the Nucore team, I was able to gather a list of suitable parts to build the Nucore system. There would be many other suitable PC components and prices, the main thing is getting a compatible CPU & motherboard without spending more than is really required. The DVD drive list below, is only required to load the initial Nucore software. So you could save the $29 and borrow the one from your own PC to install the initial software. Anyway, below is a list of what we settled on. I purchased these items from PC Case Gear http://www.pccasegear.com here in Melbourne, I've listed each item with links to their website so others can see the parts and compare specs if considering doing this themselves.
1 Vantec ION2 460W Ultra Quiet PSU $44.00 http://www.pccasegear.com/index.php?main_page=product_info&cPath=15_1110&products_id=11137
1 Samsung SH-S223C SATA DVDRW Drive $29.00 http://www.pccasegear.com/index.php?main_page=product_info&cPath=658_667&products_id=13068
1 Seagate Barracuda 500GB ST3500418AS $45.00 http://www.pccasegear.com/index.php?main_page=product_info&cPath=210_344&products_id=13263
1 AMD Athlon CPU II X2 255 $75.00 http://www.pccasegear.com/index.php?main_page=product_info&cPath=187_345&products_id=1337
1 Kingston RAM KVR1333D3N9/2G 2GB DDR3 $39.00 http://www.pccasegear.com/index.php?main_page=product_info&cPath=186_774&products_id=13719
1 ASUS M4N68T-M Motherboard $56.00 http://www.pccasegear.com/index.php?main_page=product_info&cPath=138_803&products_id=15230
Total $288.00
Thanks heaps for posting that, very useful stuff for the P2K fans. I've added a link to this thread to the Technical thread.