I just saw this black aluminium cube case for under £50:
http://www.cclonline.com/product/783...-Case/CAS0576/
http://www.novatech.co.uk/products/c...es/y902bk.html
Here are some better pictures of the case:
http://www.ebay.co.uk/itm/AMD-Bulldo...-/230752888549
It looks very similar to this case internally:
http://www.mods-n-clocks.co.uk/?p=12