If, by estate rake, you're talking about a landscape or rock rake, that would be too aggressive to use on a lawn. We use a pine straw rake (3pt, 4', very flexible tines) to pile up pine needles, small branches off the trees, other light debris including leaves. Pick up these piles with your FEL. The straw rake isn't perfect but it's generally effective
If you want a really good solution where cost isn't a problem, hook a cyclone rake to the back of your lawn tractor. The combo will pick up darn near everything including loose soil and small rocks. The only complaint I have about ours is it's TOO efficient and results in a lot of piles to pick up. /forums/images/graemlins/frown.gif