LBX

I currently use this: https://junkfoodarcades.com/collections/lbx

Switches

• I like really low profile low force keys. It makes pressing the keys really easy, fast, and ergonomic.
• The switches are mostly Kalih Choc Low Profile Purples  (25g linear).
  • On my two pinky buttons I use Pinks (20g linear). I experienced less fatigue on my pinkies after I did this. I briefly tried using pinks on all keys, but it gave me too many accidental inputs. 
• You can buy compatible switches here (chosfox).

My problem with standard switches

• This video has a good overview: Why Switches might not be optimal for Super Smash Brothers Melee!. TLDR: the high actuation points of non-low-profile switches may not lend itself well to melee (shorthopping is hard on hi-profile).