4 ft. beds and walkways from 2 to 3 ft. Wish I had made them all 3 in the beginning. I sense a bigger garden coming one of these years and when that happens there will be 3 ft walk ways everywhere.
I use a 2 ft middle. But then I don't mind having to crawl around in the jungle sometimes. Only trouble I had was with the squash going over the middle... I'll give those things more room this year.
My walkways are just a little wider than my tiller. That way when the weeds start taking over because I didn't get the mulch down heavy enough, I can just take the tiller to it without worry about hitting the veggies.