Hi there, I cant decide between these two lenses. 70-200 has constant aperture but I suppose if it isn't the f/2.8 variant then it still wont be any good in low light

and having rented one it's not quite as long as I would like on my 5DmkII

If you had the choice which would you pick?


Or should I just buy the 70-200 f/2.8 and a 2xTC :P ??