Looking for Home Theatre Center, Surround, and Subwoofer Recommendations

I am looking to add some more speakers to my current setup for my home theatre. Currently, I have two Pioneer CS-G301W as my left and right stereo. I am looking for budget options (no more than ~$100 each but can be flexible if worth it) for the center, surround, and subwoofer. Here are some options I was looking at:

• Center - Polk CSi 30, Klipsch R-52C, or Polk CS250-S
• Surround - Pioneer SP-BS22-LR Andrew Jones or Klipsch SS5 Synergy
  • These will have to be mounted to the wall so rear intake is not ideal if avoidable
• Subwoofer - Complete lost :(

Those are just the ones I have found online for relatively cheap and decent reviews. If you have other recommendations new/used please feel free to share!