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Buy the wrong scope on impulse and it'll end up like that D3100...barely used.
To get into astrophotography just use the D3100 and whatever lenses it has, that's more than enough to take great photos. I've used my D60 with 105mm lens to photography the Lagoon Nebula. The Milky Way and star clusters are dead easy with any wide angle lens. I've shot Jupiter and saturn as well...all without needing a telescope and just on a regular camera tripod. The skill (and the challenge) is processing the images, you can start doing that right now with the gear you have and there is plenty of free astrophotography software around (though I can recommend Pixinsight as a worthy purchase if you decide to stick with it).
I've given up using my Celestron 114EQ for photography recently and use an Orion 100mm tabletop dob for visual observing. At only $200 it is great value and gives suberb views. It's usable from indoors on a desk, or outside on a camera tripod. Small, light, portable and NO setting up, cooling down, calibration, or any of the other rituals that can make a larger scope more of a chore. I find much pleasure using this little scope at any moment the mood takes me and I am enjoying astronomy far more.
Most astrophotographers I've heard about use two scopes anyway, one for the photography and one for the visual. The dob suggestion is a very sound one, try finding one that is small enough for you to live with and easily use.
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