I use a Topre 86U at home and a Cherry blue Filco at work. I love both keyboards, but prefer the Filco to the Topre.
I used to have a Model M at home and at work, and switched to a Topre when we got a baby so I wouldn't wake him up. Then I realized the Model M at work was making my fingers tired (too much contrast between a Model M and a Topre), so I changed it to a blue Filco which feels "just right". I have no problem going back and forth between the two.
I tried a Cherry brown board once and it felt worse than a typical rubber dome to me. Never tried linear switches, but I suspect I wouldn't like them as I require tactile feedback. Quality scissor switches (e.g. Thinkpad keyboards) are pretty good, and I could see myself use them daily if I had to have a laptop. And Chicklet keyboards (e.g. Apple) seem to multiply my typo rate by 10, so they're out.
As for layout, I'm satisfied with a basic ANSI tenkeyless, but I have xmodmap-fu and always remap Escape left of 1 and Ctrl left of A (yes, I have a beard and I'm typing this in vim).