The 680 is a great card But I don;t know if you really need it for a 8-bay box. Highpoint has some newer SAS cards I would look at which might allow you to stretch the budget a bit and fill the casr with drives.
-Rob-
Robert Houllahan
Director / Colorist
Cinelab Inc.
http://www.cinelab.com
MAHC-PRO 6-Core 3X GTX285 20Tb SAS Wave Panel Panny 11UK SDI Plasma.