Sorry :) I live in New Zealand haha.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811121027 $50 Matx case
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128090 $90 same motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16820220174 $25 2gb ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136113 $57 Sata 250gb WD
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103212 $76 2.5ghz 4800+ X2
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106263 $24 DVD burner
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116204 $95 windows Vista.
Total: $417 for a media centre. (You can of course cheapen out if you have an old machine you can scavange parts off like I did!!) Or if you have a retail version of Xp you don't need to pay for vista and you save $100 right there.
For a games machine.
Double the ram to 4gb.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129024 $90 Case with an awesome PSU and very good quality. Highly recomended.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128335 $99 full atx motherboard 2 slot graphics.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161218 $130 - Radeon 3870 with dual slot cooling to go with the high quality.
Price: $625 with 4gb ram, Vista, high quality components etc.
@Ion storm. Im cutting my Vista install to bits on my Media centre build. I should be able to get it running lighter than a vanilla XP install.
This is posted from my other thread, 4800+ 4gb ram, Vista 64, HIS3870, Awesome Antec case, Xfire motherboard $625 If you know what you're doing but you're not an expert thats a better deal.
Tease.