Leaf Switch
[VPCLeaf]

I originally installed some "all-in-one" button/leaf switch combo from another site. After I installed them they didn't feel right and after a few days I noticed a fair bit of flutter on the right buttons which no amount of tweaking seemed to fix. I temporarily moved to some microswitches while waiting for the Virtuapin Leaf Switches to arrive and boy what a difference is made when they finally did - they feel better, they sound better (ie they don't "click" like the microswitches) and they work brilliantly.
You can't beat these switches and at $3.50 - they're a steal.