Peter Cushing is a bit of a problematic addition. I'd say that you should either open the floodgates to all the slightly off brand doctors, or accept none of them and stick with the (somewhat) canonical 13.
I also think I shouldn't have included Cushing. I will edit the poll. Although the Watcher and the Valeyard are also known as the Doctor, they can't really be said to be THE Doctor. And for the meta-crisis Ten, I think we can say he is basically Ten, so Ten and meta-crisis Ten are both reffered to as Tennant.
There's a better OpiWiki's tool to deal with such questions: Items and Rankings.
You can add every doctor as an item, and then add them to a ranking (e.g. "best Doctor Who doctors", you'd have to create it as well).
Example item format: Superman (by Christopher Reeve), example ranking: Best Harry Potter books (all time).
That way it is much better organized, more meaningful, and there's no problem to add a new doctor in the future.
Thanks for that. I will do it this way as soon as I can.