I have the k62, and GPU size is not an issue. any video card can just extend into the 5.25 drive bay if needed (though a 5970 will fit without doing do)
son unless you have 4 disk drives, fitting in a large GPU should not be an issue.
According to this picture: (I don't know if 290 mm or 11.4 inches space shown here will allow anyone to have an 11 inch videos card. It seems the room only has 0.4 inches to spare a very tiny margin to feel comfortable).
I am not too sure that the Lancool PC-K62 can fit the video cards I mentioned in my initial post. I would like to buy a Lancool PC-K62, but from some pictures shown here. I start to believe the CM Storm Sniper BE may be a better choice. Still I would like to see if anyone can prove me wrong. Anyhow, I thanks everyone for all your suggestions since they are all good suggestions. This is a hard decision since I want to save any pretty penny on any component if I can.