rear surround speaker

Audio Advisor has wall-mountable $800/pair JM Lab/Focal surround speakers on sale for $189/pair here.

Otherwise, for wall- or ceiling-mount rear surrounds, I'd go with Mirage Omnisat satellites or NanoSats. They have built-in wall-mounts and are omnidirectional, which is definitely preferred for surround.

About those Mirage-licensed Omnisat knock-offs: for the money, they'd be a good value and probably are excellent computer speakers. But for home theater, you might want to consider this: These licensed speakers are nowhere near the same performance or build quality of the originals. The originals use butyl surround titanium deposit poly drivers and cloth-surround pure titanium dome tweeters, are down 3dB at 70 Hz and have power handling of about 175 watts. The knock-offs use a paper driver, go down to about 135 Hz (a full octave higher), and only handle 55 watts. It's the power handling that concerns me the most about HT.

That said, I have Mirage Omnisats, and the way this speaker design radiates and energizes the room is great. At $39 (down from $89) you'd get a lot of that and I can't say enough for the effectiveness of that design.