Buy any good steel bike. Steel is forgiving of big folks. Especially the old school 27in wheel ones.
This does not agree with my experience at all. Old steel bikes I have ridden (Peugeots, Raleighs, Norcos, Fujis and others) are great bikes, but I have found them to be less durable than modern aluminum bikes, and probably much less durable than modern steel bikes like Surlys.
Further, most old steel bikes were flexible like a wet noodle, especially under a heavier rider. I have had a couple bikes that flexed so much at the bottom bracket that you could induce front shifting by hard pedalling out of the saddle.
The last old steel bike I had - a Raleigh from the early 80s - suffered a front-end collision
at walking pace and the frame and fork folded such that I had to
carry the bike home.