Thinking about doing an upgrade from my 3100 body to a 5100 body, but I'm wondering what the best time to do this is. I prefer the swivel viewfinder on the 5100 when I take shots from the ground and there are several other features I'm very interested in. I snagged my kit (that came with two lenses) for about $740, so I don't think I would lose too much cash selling the body, but I'm wondering if there is a good way to find coupons or sales on bodies. Suggestions? Thanks!