Hi Chand and welcome to the forum!
Klipsch and Polk are major brands and both make ok to good speakers.
Been there and done that with both and I've moved on to better stuff for the money.
Make sure you can audition both at home (no hassle return) to ensure that you're happy with them.
Subwoofers are a different story..
1st there is no reason to buy a brand matched subwoofer from either of these companies.
For the money you're looking at , you can buy a FAR superior sub from companies like SVS, HSU, Rythmik, PowerSound Audio, and a few others.
More folks will likely chime in with their recommendations and I suggest you listen to what they have to say. Lots of free good advice and the opinions here that are worth considering.
Enjoy the journey!!
Cheers, Mac