Hi guys, I've got an internal struggle going on here: For the longest time I've been wanting the Tamron AF 28-300mm f/3.5-6.3 XR Di LD VC lens. I like this lens a LOT because of how compact it is, yet how wide the zoom range is. I also know the VC is remarkable because of the 3-coil system they have going on, compared to the usual two. The only problem I'm thinking of is the AF on that lens- noisy and slow. Thats where the Canon EF 70-300mm f/4-5.6 IS USM comes into play. I've heard the AF is incredibly fast and quiet on this lens. I was thinking it might be worth it to sacrifice the extra 42mm and 3-coil system to buy this lens just for the AF. Any suggestions? Thank you in advance!