I've been forced to keep a 3.1 setup for a while now because I've had sectional couches that didn't allow me to put rear speakers. I'm going 5.1 now since I've got more space-friendly couches and I would like to relegate my old front speakers, Polk Monitor50's, to be rear speakers and get new front speakers. However, my center speaker is the Polk CS2 and I have not had a problem with it at any point.
1. Am I "forbidden" from mismatching my center channel with higher model/different brand front speakers?
2. Is my plan, overall, fine? Do you recommend me do something else with my Monitor50's, or is relegating them to the rear my best option?
3. I'd like to get the two new front speakers for ~$300-400 total, any recommendations? Are there any speaker pairs that frequently go on sale?