There is some good news from a switch from digiscoping to dslr photography, in that your ability to crop and enlarge the subject with a photo from a dslr is far greater than that from a compact digital camera, even with similar pixel counts.
Another benefit is the noise factor at higher iso levels, meaning you can get excellent results with a dslr camera up to (and past in some cases) ISO800.
nirofo's reply is spot on, in that you will need to work on the fundamentals of getting closer to the subject but the rewards will be very high with a dslr and even a modest lens. Certainly the Tamron 200-500 and the Sigma 50-500 should be top of your list as far as reach for ££.
cheers,
Andy
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