I've been down this road a few times too...
The new reissue Jensens have nothing in common with the old ones, other than the look. Not recommended... though not as bad as some people say either - I had one of their 8" and it was not bad... but certainly not great either.
I put a weber in my 5E3 clone, I think it was a 12a 125. I like it, and would recommend it. That's Ted Weber... webervst.com Probably the most historically accurate thing available right now.
If you decide to go against the "historic" route, avatarspeakers.com has great prices on raw Eminence and Celestions.
One more thing - I was able to get a champ speaker reconed by Gerald Weber, who had the correct vintage parts - not sure if he has the cones for a 12" though.
http://www.kendrick-amplifiers.com.
Some people have mixed feelings about Gerald, but I like him. Not cheap, though...
I think if you can find the correct cone, I would go ahead and recone. You've already lost the "collector value" of the speaker by blowing it - reconing it is not going to make it worth less than if it were blown.
Mike