I also have a 690 and think it's great for a gaming case but definitely still has shortcomings...
Plenty of places for fans
Loadsa room for mutli gpu setup
Fairly decent cable management
Probably more stuff that i can't think of...
The tool-less mechanisms (PCI, 3.5 and 5.25") leave a lot to be desired
The two side fans on the 690 tend to make the whole side of the
Oh yea, and to add/remove 5.25" devices you need to remove the whole front panel... which isn't easy and if you're not careful you might break one of the thin plastic pegs that secure it to the front frame of the case
As for the K60... reviews seem few and far between but theres one here:http://www.casemodblog.com/?p=1103
and a video review here:http://www.youtube.com/watch?v=U2MdUGxWEcU
Also.. Consider that if the K60 is $20 more, that's really more like $10, as the CM690 comes with one less fan than the K60