Get the 24-85 F3.5-4.5 lens instead of the 28-135IS.

It's sharper, lighter, and more contrasty (all good things), and is compact enough to still permit use of the built-in camera flash. The 28-135 partially blocks the flash, and just isn't as good overall.

I have the 28-135, and wish I'd gotten the 24-85 instead for my "small" lens.

My main lenses are the standard L series zoom trio: 16-35, 24-70, 70-200-IS, all with constant F2.8 maximum aperatures. But those are all big and heavy, and definitely block the built-in flash.

Cheers