Thanks for all the great info everyone. I think I'm convinced to go the vari route now, and I'm looking real hard at the Singh-ray. One quick follow up question if you don't mind...
According to this comparison test (
http://www.learningdslrvideo.com/var...lter-shootout/) the gentlemen didn't rank the Singh-ray very high due to vignetting and cost-per-quality considerations. Do you guys think his tests and conclusions are valid? Or did he just get a bad copy of the Singh-ray?
Thanks again for the help. This just became my new favorite photography forum!