I have been a D100 user for over 5 years now and I'm ready for a change. It's just too heavy and I am being wooed by the newer Nikon bodies. However, do I really need to step up to the D200 to still be happy (I have loved my D100 to date in terms of the quality and performance)? I stopped into a camera shop this week and the salesman couldn't bad-talk Nikon enough and told me that Canon is the ONLY way to go, but I already have so much invested in lenses for my Nikon. Would the D70s make me a happy camper?