1.Astrophotography: Astrophotography, even in the age of digital cameras, is pretty advanced stuff that requires a lot of time and equipment. Trying to jump into it, or making your telescope buying decisions based on it, is like learning to swim by jumping into a the deep end of the pool. First make certain that you enjoy astronomy, and can commit the time for basic viewing before you even consider taking up astrophotography. Remember that if you need a different mount than what you initially buy as your first telescope that you can usually sell the old telescope at a reasonable price.
2.Ultra-High End GPS Super GoTo Computer Guidance Systems: These systems, while great, can actually be problematic. They are expensive, aren't the 'idiot-proof' systems some folks make them out to be, they limit you from learning about the night sky, and many designs actually require that you aim with the computer. This means if the computer's motors run out of battery power, you can't even aim the telescope yourself! Basic guidance systems, such as the Orion Intelliscope line are useful for finding objects in the night sky without taking the experience away from you! Consider these instead of completely controlled systems.
3.Color! If one were to look through a book of astronomy picture you would think that every view of the night sky through a telescope is awash in bright, pretty colors. Sadly, this is not the case. Most of these photos are taken with long exposure photography and show colors that, while there, are not apparent to the human eye. Be realistic about what you see, and make certain that the telescope you buy doesn't have tons of unrealistic photos on its box (which were usually taken by the Hubble Space Telescope or the Viking and Voyager probes!).

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