So I finally made up my mind and purchased the Canon 7D.. I bought a Sigma 70-200mm f/2.8 DG HSM II Macro Zoom Lens to go with it.. But the more I read reviews, the more uneasy I become... Is this a good enough lens for my body? Or should I return it, pick up a cheap lens for temporary use, save money (not REALLY going to need a nice lens through winter) and get myself a top notch lens once baseball season comes around? Thanks in advance for any input.