I've heard the corsair k mechanicals are not full mechanical keyboards. I think the function keys are not mechanical.
I've heard there's Ducky, Das, Deck that are good mechanicals. But I can only find Das here and they don't have an illuminated keyboard (which I was looking for). If you are looking for illuminated keys, then your choices become very limited.
There's the Black Widow Ultimate (which I heard has some sticky key issues), Deck (which illuminates the key letters and around the keys; and the best from many users, but pricey and not available everywhere). I've settled with the Mionix Zibal 60 which I currently like and available where I am. It's a little pricey even after price matching, but it's still nice. Though it doesn't have tactile feedback. It's a linear black cherry mechanical switch.