Damn, all these edgy gaymur styles in here lmao.
I agree with OP, I like that flat look, and the backlighting/illumination on the keys is really nice, especially if you sit in the dark a lot.
Personally, I'm using the K740 and goddamn am I ever liking it.
It's membrane, but the response is very good. I like it quiet, when I type fast to get an assignment done in an hour or something, I don't like anything noisy. I don't wear headphones often.
When doing a ghosting test (holding both shift keys and typing) I get 18/26, so that's nice.
The lights on the keys aren't too bright to burn your eyes when it's dark, but they're a lot softer. I usually have my brightness down a bit to be easier on the eyes.