I upgraded to a 7970 so I no long have a need for this waterblock I had planned on using for my 5870.  Here is a link to the block for reference:
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_971_240_576&products_id=26664  The block is new in the box with included accessories.  There is a small (1/4 to 1/2") ding on the upper edge of the inside of the block that looks like it happened in manufacturing.  This shouldn't have any effect on the block at all since its in a spot that doesn't touch the card, and it could easily be smoothed out if needed.  I am asking 12 BTC shipped in the US, overseas shipping i'd have to figure it out.  I'm fairly new here so i'm including my heatware and ebay feedback and would be glad to verify for the buyer.

http://heatware.com/eval.php?id=42750 Heatware
http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=squirrelman&ftab=AllFeedback&items=25 Ebay

http://i.imgur.com/bHlhh.jpg