Ducky or if you have the money, HHKB. Avoid all the "gamery" keyboards as they often have non standard bottom rows, some have crappy switches, and not stealthy. r/mechanicalkeyboards can help you out alot in this respect.
What switch type are you looking for? Linear? Tactile? cherry? Alps? That's the first thing to look for and see what you want. If you have no idea you can always head down to BestBuy and try out their show boards, although I'm pretty sure it's just Razer switches, Logitech ones, and Cherry browns.