I think for planets a webcam is more often used than a DSLR (those are more suitable for DSO).
I don't know if there is an astronomy club close to you?, you could go out there to get some information and possibly ''play'' with some of the gear available before purchasing any.
I have a dobson telescope and used it with an adapter to take pictures of the moon and saturn/jupiter.
Results of the moon are great, but a full frame body for planets is not putting enough pixels on them.
Also for planets / nebulas (basically anything but the moon), you combine many images to get a far better result.
For DSO's you want longer exposures and need a good tracking system, then afterwards you correct each image before combining them to 1 image ( ideally you use different filters: for example for a galaxy a R V an B filter, take multiple exposures (different lengths) in each filter to reach a certain number of counts that reach your sensor, then you correct each image for a : flat field/dark/bias and combine the different images to one nice image).
This requires a good tracking system, ccd and software.
There are lots of people who make beatiful images with their DSLR (they also correct for dark i think), and us tracking system with follow scope(to ensure the tracking keeps tracking correctly).
Last time i checked tracking systems (even simple ones) were quite expensive (eq5 and eq6 were 600-1200 dollars), a good dobson telescope for DSO is another 1000.
For planets a ''simple'' refractor and 20$ webcam (modified) will yield better results than a dslr!, you take hundreds of images and combine them afterwards with software.
I think you dont need a good tracking system for that either , a bit more work on aligning the images afterwards maybe but it should be doable.
The moon is the most easy to do, but you will want more, where i live there is an astronomy club(not 2 many members), where for 50 euros/year you get membership and access to the telescope ( +- 24 inch/60cm reflector with a great tracking system, where you can connect your dslr with an adapter).
Alternatively you could visit a university for more information!, most people who are into these kind of things love to share knowledge and give advice/tips etc.
If you got something like that close to you, there would be no need to spend a lot of money , and you can photograph different objects ( moon/planets and dso's). Or at least orientate a lot better before spending the money!
Hope it was of any use.