Don't want to hijack the thread, but have Tamron released the IS/VR/OS version of the 17-50 f2.8 yet?
...or get something like the Canon 28-135 IS USM. Good walkabout lens, good for portraits, landscapes and even sport if the action isn't too far off (but I would recommend this as its my next purchase!!). Well within budget, and really, there's no point in blowing the whole budget in one go. This way you could get some polarising filters for some nice landscape shots, and maybe a good tripod.
