Hi Aseem, it may be too late for an answer, but I'll do it any way. Sorry you didn't get a response sooner.
Unless you have an unusual situation, almost any amp or receiver will do, because Klipsch speakers are very efficient. Just get the features you want. For myself, my current receiver is a Denon, and my next will most likely be one too. After 12 years with my AVR-1803 I'm thinking of a AVR-X3100W.