A couple of years ago I bought my first digital SLR, the Olympus e420. It takes great pictures when there is a lot of light, but I'm not happy with its performance in low light. It seems that if I use an ISO of 800 or higher, there is a lot of digital noise. I find this extremely frustrating. I like to take candids and and I don't want to be surprising people with flashes all the time. I suspect my issues stem from the fact that the Olympus uses the 4/3rds system. Please correct me if I'm wrong. It probably doesn't help that none of my current lenses have an f stop higer than 3.5, either.
So, I want to switch to Nikon or Canon...spending about $800 or so. Any recommendations? Or should I just buy a nicer lens for my Olympus?