I'm going to pour some effort and resources into building up a wheel for a vintage road bike (Miele Lupa) that I like and hope to ride for a long time to come. Based on the parts that I have on hand, my options are:

1) 6 Speed Freewheel.

2) 7 Speed Freewheel.

3) 7 Speed Freehub.

Were cassette availability not a concern, the freehub would be my preference. That said, quality 7 speed road cassettes that don't cost a fortune seem to be becoming increasingly hard to find. Sunrace and Microshift have offerings for now. Big $$$ cassettes will likely continue to be available from high end manufacturers but, for a mid-range vintage bike that I probably couldn't sell for $300, I don't want to be limited to cassettes that cost more than about $80. And, based on what I see in the market, I get the impression that reasonably priced , 7 speed road freewheels might actually be available longer than equivalent free-hubs. You know, without resorting to mountain bike cassettes.

To my question: if you were in my shoes, which of the three options listed would you prefer? And why?