Mine is
mini itx via epia M http://www.ascent.co.nz/mn-product-spec.asp?pid=113037 $320
512 ddr ram $180 has to be low profile or it wont fit under the optical drive if you want one.
120 gig WD 8mb drive $160
round cabling $30
cupid case with 1 pci slot which has a wifi card in it - it was from procase but i cant see it there anymore. External psu's are best for small cases.
slightly larger http://www.ascent.co.nz/mn-product-spec.asp?pid=111634 will take normal size fdd and dvd/cd roms (the cupid uses slimline which are expensive)
also http://www.ascent.co.nz/mn-product-spec.asp?pid=108565 might be worth a look.
http://www.procase.co.nz/pc/cs2677mini.htm