Kelly, like you I'm an animal photographer. My wife and I voluteer at the local humane society and photograph most of critters there on a weekly basis. I usually place them on table and use two SB-600 fired through an umbrella controlled by my SB-800. Back to your question, for a second body I'd consider something like the D3200. We use a D2X, D300s and D700 and a zoom lens. I'm seriously considering the D3200 for the wife because she doesn't like the weight with flash attached compared to the other bodies.