I own a HAF 932 is has a ton of room in there. I'm running three HDDs in there but I'm only running one graphics card but there's plenty of room for a second one. I'm not running any custom cooling but there are mounting points in the top of the case for a liquid cooling radiator. In fact it has mounting points galore. Not seen the Cosmo II but the 932 is an awesome case in my book I might upgrade the insides but I don't feel like I'll ever need a case upgrade again this thing just rocks in my book.
I also like that there's no stupid door covering the external bays so I can shove my blu-rays in the drive easily without having to open a door first but that's just me.