Thanks Pjonesy. The blue 99 definitely seems to be the most popular...with good reason from the sounds of it.
Perhaps that, and the black 94 (two very different racquets), could be a good pair to buy, sight unseen. Keep the favorite and on-sell the other. Is it hard to sell a used Donnay?
The other wildcard is the Red 99 but it seems to have really mixed reports.