I'm starting to shop (on eBay) for a 7 speed freewheel - one of those racing ones, not a 28T or bigger one...so I can pretty much exclude Shimano SIS compatible, which I know well and love.

My question is, is there any big difference between the brands I see? Any better or worse? I am going to bid on Sachs, Suntours, Maillards, just about anything that comes along.

These are the close ratio ones...something like 13-14-15-16-17-19-21 or like that.