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In bird photography there is high probability that you will many times feel what ever zoom you have, is appearing to fall short and longer focal length would have been better
My understanding is - it should be better to opt for the Canon EF 75-300mm f/4-5.6 III USM Lens which should cost around Rs.12000 INR = USD 230 approx. With this lens you get equivalent zoom of 480mm (300 x 1.6 crop factor) where as with 55-250 you can achieve max of 400 (250 x 1.6 crop factor). The total package of 550D + 18-55 kit with the additional EF 75-300mm f/4-5.6 III USM should be less than the budget of INR 50,000 and the saving of Rs.2,500 odd will get you a polarizing filter for use in landscape shots.
Though this lens is not stabilised like the 55-250 ll IS but the difference in stops can well be managed by increasing the ISO to attain higher shutter speed. And as a new entrant to bird photography with DSLR, you will very rarely like to venture to shoot in low light where the IS (Image Stabilisation) might have mattered.
As for the gap between 55(18-55) of kit to 75(75-300) of zoom lens is actually a matter of just few steps.
Me too in India, should it help please feel free to contact over cell no PMed.