Hi all,


I am looking to expand on my lens collection, whihc at the moment consists solely of a 50mm 1.8 mkII (whihc is an awesome lens, btw).


I'd like a lens for mostly for street portraits as well as a little sports and movement action. The 70-200 focal length suits me well, but I can't decide between the f4 with IS and the f2.8 without IS.


Ideally I'd like to leave the tripod at home (it makes you so much moreconspicuouswhen trying to take candid shots). Would the faster aperture make up for the lack of IS? Or will IS allow me to go to slower shutter speeds and get more light in that way? The shallower DOF of the 2.8 is also attractive.


In addition to a long lens, I would also like some wide angle glass for architecture and urban landscapes. I've tried a friends 17-40 L and its very nice indeed, the wide end seems wide enough for me. For those that have the 10-22, is it too wide some uses or is the smaller focal range ok? The flexibility of having a wider zoom range seems worthwhile.


Thanks for any advice.


Cheers,


A.