Selecting Rear Surrounds for 5.1 system

I needed to ceiling mount my rears, so I bought a pair of PSB C500 speakers. I Bluetooth the rear channel to a Denon integrated amp that I already owned.

You could Bluetooth to amplified speakers like @soix mentioned. You'll need to run power to them. 

Thank you Soix ans sis883 for your suggestions.  I went over the Best Buy meantime and asked the Magnolia room person the same. He said its best to balance the room with B&W 704 or 705.  He was against using KEFs or Polks or Martin Logans in the back when 702s were in front. He said that they perform quite differently. They sell KEFs and MLs also.

Just for kicks, I asked if I could put B&W 803s in front and move the 702s to the back - he said that would be way overkill.

I'm a 2-channel guy.  My system is set up such that none of the HT gear is in the chain when listening to music. 

I don't have room for floor standers in the rear.  I do, but the location would be less than Ideal. 

Did you buy the B&W rears?  You could try an inexpensive option and see if you like it.   B&W floor standers seem expensive for rears.  IDK.  I'm not a home theatre expert.  Tonally matching the center channel and mains makes sense.  I'm not so sure about the rears.  There isn't much dialog going on in the rears.

I have two REL subs in front and a larger SVS in the rear.  The SVS only runs when doing HT. 

the rear content is for Video, primarily for directional cues, helicoptors flying in, gunshots, audience noise ...., characters approaching from the rear/side ..... the most important thing is to match the efficiency with your fronts and center, and I expect you can refine the volume with test tones in your AVR. Perfect frequency blend is not an issue IME

I am currently replacing a center because the Klipsch center I bought is much too efficient, I have the fronts boosted and it cut, I just bought a Jamo from Denmark, and made an offer on a Polk center, both in real Cherry Wood cases, both with similar efficiency to my DBX FL & FR.

Here’s the Klipsch, fits within the riser I built, looks cool with the magnetic cover off, but poor volume blend

I’ll mess with all 3, keep whatever sounds best, sell or give the others away.

here's the Polk I made an offer on

and the Jamo I bought