I think that any of the entry level dslr's would serve you very well, the biggest advantages over your camera will be the speed and the image quality, both of which should be significant. Personally I'd sway towards either Canon or Nikon as there are more secondhand good quality, AF lenses available for these two than the other makes. (I know that I will be shot down for making such a suggestion).
As for lenses the Sigma 170-500 is very hard to beat for the money. You should be able to pick up a good secondhand one for ~£300. There are better lenses out there, but they cost a good deal more. The 170-500 is a very capable lens, AF is fairly swift and it is a nice weight to handholding, though you will get better results on a tripod. One of my best bird photos was taken using this lens on a Canon 300D...
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