What does DA stand for? Dumbledore's Army?Deathadder, I guess.
So i'm interested in a mechanical gaming keyboard with MX Browns (or equivalent) and that has RGB lighting (may be a waste of money but oh well)Coolermaster make very nice keyboards, a lot of osu! players seem to use them. I didn't take the time to check if they have models with RGB lightning but as you said, that's a waste of money and I wouldn't care about it if I were you. You'll probably think it looks cool for about a week max and then regret spending extra money for it.
Steelseries - their board isn't out yet
Logitech - it looks terrible quality
Razer - I love the look of it and I tried a friends tournament stealth and felt pretty good (I will admit to bias though, as I have other Razer products)
Corsair - not bad, this was the runner up
I've seen negative reviews like that, I've also seen positive ones... I don't know, what are your preferred keyboards, any other brands?