Poor low light performance is a turn-off . OTH the D90 is old and the D600 is out of my price range (considering the lenses I would want to buy with it).
I was just thinking that huge lens I mentioned would have been great for taking landscape pictures from Iwo Jima and from the top of Mt. Fuji. From your comment though I guess a pic of the full moon with that lens and a D5200 wouldn't turn out that well. Guess I need to wait for a miracle sale or something.
Just broke my personal record for number of consecutive days without dying!