Hey all, Just looking for some thoughts... I shoot a lot of sports and currently have an older sigma 70-200 f/2.8 HSM lens I use (and really like), and have been playing with upgrading to the Canon L series glass. I shoot primarily for a local adult sport and social club; it pays enough for me to buy more equipment, haha. So I was looking at the IS vs IS II lenses and was wondering if it's worth the upgrade to IS II. Shooting sports I'm never below 800 shutter speed, so the actual IS doesn't bother me... I'm looking more towards the AI-Servo tracking qualities of the IS II. If I should go with an IS lens, what would a fair price be for one of these? I see anywhere between $1,000 to $1,200 on eBay... some guy locally has one for $1,400 (but I wouldn't pay that much... go a little more and get the 2). What would a fair offer be if I do choose to go that way? Thanks!