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For both photography and visual the best option IMHO is a skywatcher or Orion Maksutov-Newtonian, there are typically 190mm aperture and f/4.5 to f/5.6. Visually superb, and a nice medium field and fast enough for taking some nice photos very easily.
Finding one secondhand is very hard, new they're out of you're budget though, and the other issue is a mount to match.
FWIW The smallest cassegrains with 2" backs are the skywatcher 180mm f/15 maksutov and the Intes Micro M703, 180mm aperture x f/10. Both are primarily visual scopes, for moon and planets, not suited to photography.
Last edited by Wavytone; 31-01-2015 at 10:01 PM.
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