As far as End Game Keyboard, I think it is something that to you looks amazing, feels amazing, works amazing, and you absolutely love it. 
I've had many boards I love, they work great, they feel awesome, they look really nice.. But then I end up wanting to try something else. 
So either I keep collecting multiple, or I sell/trade to fund a new keyboard goal. 
My "End Game board" should be to me soon, Ive been waiting a few months for it. It should be worth the wait. 
But also, I have another awesome project coming which may be it.. So tough to decide so I will just collect them all and have many..