Karthik, aren't you really going for the big ones here? Mid size?
Start with the smaller species my friend. If things go awry, the small ones are easier to rehome or rehabilitate. I think only Sun Catfish in this list suit a beginner catfish keeper, and even that not that much, since it can cross half a foot. And they like schooling!
I never dared keep them due to the group habit they have. Have seen them being sold several times in Royal Aquarium. Clarias I had when I was in college. The fish had an appetite! yeow. i released it since it was native, in a big pond. It jumped. It could sting. ..
Goonch Catfish

The less said the better.
if you did not mean native indian catfish only, and have access to an importer, why don't you check this species out? i love it coz it is a community fish too, and has the lucidity of motion that the clarias has without the big big stomach.