Finally found an umbrella to fits my smaller (36"} table.  It will fit a 42" table also without overpowering the table.  I have a 35lb umbrella base and find the umbrella very sturdy. I have kept it open in winds up to 20mph and found it to be very sturdy. We can frequently get winds at 30-40mph by the coast, I don't choose to keep it open so I can't attest to it's stability during that.