It seems that during discussions about upgrades people always talk about PowerLogix and Sonnet but never Giga. The article below seems to slightly favor Giga. Does the Giga GC5A-1250-D2 fit in the Cube (I could not tell from the web site)? The following article is a good read: http://www.insidemacgames.com/features/view.php?ID=219&Page=1 -Phil