So many lenses out there and deciding what to buy. I am looking at the following lenses to use for travel and taking photos of the family during events etc... I will be picking up either a 20 or 30D. Of the 2 lenses, what would be more beneficial. The ef-s 18-55IS (about 100 bucks) and the ef-s 17-85 IS (about 350 bucks). Or other suggestions in lieu of the aforementioned. I already have a Tamron 28-300 XR DI with VC. I am leaning towards the 17-85 and not lugging the tamron around on vac.. Thoughts?


