[bigeasy1]

A second vote for the Strataglass.
I have the same boat as you(74 Tsunami I/O).
If you were a bit closer to my area,I have a canvas guy who does beautiful work for very reasonable prices.
I had him do the canvas and isinglass work for me and I couldn't be happier.He made the top,the front windows,the rear drop curtain,with a zippered door,the side windows,and a rear aft curtain that runs from the top down to the transom.
Everything ran about $1,400.00.

Just my opinion here,but for canvas,I'd recommend either Seamark Sunbrella,or Sunbrella Supreme.Both have a vinyl layer applied to the backside of the fabric,which makes them totally waterproof.Both are extremely durable and very soft.It is a pretty heavy material and more durable than standard sunbrella or other polyesters.
I went with the Seamark.It's a company that buys sunbrella fabric and coats it.The sunbrella supreme is made by sunbrella themselves.It is almost the same except that the vinvl layer has a fleece flocking on it,which is nice.It wasn't avaliable in the color I wanted when I had the top made.