Roaming Wireless Data Card In India: Need Suggestions

I am planning a short India trip at end of this month, and need some suggestions on a wireless data card so that I can be connected outside of metro areas. The situation: my family lives in Aligarh, about 125 kms from Delhi, and Internet access there is still a pain: no real broadband to speak of and even then it is flaky. I am thinking of getting a Reliance or Tata wireless data card in Delhi, and then use it as roaming in Aligarh, but some people have told me it may not work that way.
Wondering if any of our readers know about this, and/or any other suggestions on staying connected outside and even traveling within Delhi. Also, do any of these companies have a pre-paid data card, or would I have to get a contract/post-paid? And how easy or difficult is it to get one in a store?
Post in comments below, or e-mail me at rali AT paidcontent.org.

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