Your absolute best match will be a pair of SF Liuto monitors or a pair of the SF Liuto Smarts. Looks like the Smarts will give you more placement flexibility since they come with wall brackets and can be used horizontally or vertically. I would definitely use a SF speaker.
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In the very early days of surround sound with only Dolby Pro Logic, the rear channels were mono, limited bandwidth, and even less power than the front in the A/V receivers. In that case I would say rear channel speakers might not be as critical as the front. Today is a totally different story since 5.1 surround sound is 5 discrete full bandwidth channels with a separate subwoofer channel. Take a look at the picture here,
Obviously that jet would sound the same, front or rear in the room with another pair of SF Liuto towers for the rear, and some people would do just that. The next best thing is my previous recommendation. As you keep dropping quality and/or moving to another brand, then that 747 jet on the front may sound like a 2 passenger prop aircraft on the rear. Matching the rears with the fronts will give you a better balance to the sound throughout the room.