Hi . I currently own a Sony A200 and have three lenses, kit lens 18-70, Sigma 70-300 and Minolta 50 mm f1.7. The A200 is a camera I enjoy using but the higher iso performance isn't brilliant and of my lenses the 50 mm is great but the AF speed on the others is sluggish in anything but good light . So my question is when i go to upgrade in the future should I upgrade the body or the lenses, I suppose I am asking is good glass more important than a good body? Which way would you go ? I should say it takes a long time for me to get the finances available to change gear so I couldn't just do a complete change of body and lenses .