I love the IBM Model M's
Was just tripping on one the other night in old gear pile of mine... might clean it up and get it wired up... Crazy to see new-in-box ones listed for $600 on Ebay right now.
I tend to use el cheapo keyboards with center hump style and sculpted overall area... Nothing fancy... They are throwaways / use and replace every couple years tops.
Using a mega cheap LARGE letter keyboard right now... I buy them, wear the keys and pitch them... Can justify that with $10 keyboard....
Part of it is hygiene... Pretty nasty what lurks in folks keyboards.... and why I am not breaking out a small fortune for one ever... Office policy for any new employee is if not a new computer, they always get a new mouse and keyboard.. others get thrown in storage for parts/crash carts/whatever....