Kaline

All: I am new to this forum and am looking for recommendations for what center channel and rear speakers would work well with my Klipsch 3.2 KG speakers. I will be using them with a Harmon-Kardon AVR30 receiver. My living room is small: Approx 16' wide X 14' deep with a 9' ceiling. I have a tight budget, so used speaker recommendations are OK (esp. since my speakers are 15 years old). Any recommendations (new or used) are appreciated!