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while i have not been to Harike so far, I believe its a wetland. Generally a 300+2x will serve you well. Depending on where you are going in north there are other destinations as well. for example Corbett & Sattal would be good for birding in winters and your 300+1.4 would be a good choice there. Do keep in mind that winters would give you shortened shooting hours due to fog. there is a very active community called IndianBirds (http://www.facebook.com/groups/indianbirds/) where a lot of birders/photographers from Delhi are very active. They can give you some good advice.
Generally speaking your 300 + 2x would serve you well, I would suggest that you carry a 1.4x as well if you can.
I am planning to get to Sattal this Dec for a couple of weeks to shoot some Himalayan birds. Hopefully that trip will workout :-)