The AEK2 uses "dampened cream" Alps with a little rubber bumper that changes the resonance. The caps are nice PBT and the boards are well made. I prefer the original AEK with orange Alps, but that is just me.
I think that there may have be an SGI or other board with dampened Alps, but the AEK2 is by far the most common. They are cheap and plentiful on ebay, but if you are outside of the US, the shipping will cost far more than the board itself.