I want to upgrade my body (camera!) as well, although I'm also thinking about buying a long lens, or a 70-200 L, or a telescope, I've been trying to decide what to do for a couple of years, and still can't make up my mind. Although if I had a friend with a good telescope, I might invite myself round to his house with a few beers

, which would take one thing out of the equation.
A couple of years ago, my daughter won her school quite a good telescope. I suggested to the Head, that it would be nice if we borrowed it for a weekend. The moon looked fantastic, but when we saw the rings around Saturn, it was quite surreal.
BTW did you see that photograph of the ISS taken with a 7D that I posted in this thread a little earlier.
Nick