Hi Ellen, Great to hear you're still enjoying it.
As I mentioned previously, Anita, my wife, uses an E520 and 70-300mm lens, it's her standard setup, she produces some great images with it.
Here's a link to one of the pics I took a couple of weeks agon on the Farne Islands, there are a few new images there, all with the E510 and either the ZD 50-200 or the Bigma.
Wildlife :: Puffin picture by DaveGoodwin - Photobucket
You'll love the Sigma macro lenses, we have both the 105mm and the 150mm, I'd recommend the 150mm, it's capable of producing stunning results. I'll look forward to seeing your pics when you get one.