Interchangeable Lens Camera
You may get DSLR but it's too tight.
1100D with kit lens + Tamron 70-300 (Non VC) or
D3100 with kit lens + Nikkor 70-300 (Non VR)
I am not so sure about this combo is good. Sujoy or someone who is using DSLR can comment about this...
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for 25K-30 K i will suggest DSLR (either canon 550 + 18-55mm IS or D3100 with kit lens ). But you will not get any zoom (required for birding etc)..for family events,landscape etc this should be good...latter you can add 50mm (6k) ....
about the combo :
1100D with kit lens + Tamron 70-300 (Non VC) : i have seen many people using canon 1100d and taking excellent photo but i think better to buy at least 550D. Tamron 70-300 is not a good option.for cheap zoom lens canon 50-250 IS is best (around 15K) .In general i am not satisfied with quality of pics using cheap zooms and these are too short for birding...
D3100 with kit lens + Nikkor 70-300 (Non VR) : is this combination under 30K..if it is then this might be a good option.. personally i prefer IS/VR as i dont shoot using tripod. 70-300 VR is very good lens not sure how this non VR version performs.