Like they said: old-school steel Schwinn frames rank pretty high. Mine was an old welded-steel 1948 JC Higgins cruiser. Older, heavier, welded steel frames tend to work pretty well for what we do. Watch for cracks on any frame you choose.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style