Best quality would probably be GM replacement. Cost is pretty high though. I used Soffseal on my 82 TA and I was happy with the quality of the t top replacements. They are thicker then the originals and require some window adjustments to get them to close correctly.
For the door weatherstrip I used Fairchild door seals because they have the plastic screw retainer built into the ends and fit very well.
I used GM outer window sweeps and they fit OK, but kit seems the replacements from 1A auto fit about the same.
I used 1A inner window sweeps and thought they fit and looked great.
I used Metro for the window triangles and thought they fit good.
I used Metro for the hatch seal and was not quite happy with it because it did not have the same shape as the original, and did not touch the glass in all spots due to the design.
I used Soffseal for the cowl seal and was somewhat disappointed with it because the retainer pins were not installed, whereas other companies have the pins pre-installed. Plus you can find original GM on Ebay occasionally for not much money.
For the t top drip edge I used the rubber ones from 1A and I found them to not fit well in the corners. The shape of them does not allow the rubber to sit against the plastic edge. They sent me the plastic replacements but I have not had a chance to install them yet.
I had some pics in this thread that might help you out.
Weatherstripping? - Turbo Trans Am Forum