Help me choose between these 2 speakers

[I Bleed Blu]

Klipsch RS-62 Rear Surround Speakers or Klipsch RB-81 Bookshelf speakers... If your familiar with Klipsch's products then maybe you can help me decide between the two. My biggest concern is with the RS-62 I will have to mount them about 4-5 feet above ear level on the back wall because my living room and kitchen are one big open room. Do you guys think mounting the rear surround speakers that high will have a major affect on the sound? If I get the bookshelf speakers I will have to buy stands and have them sitting in the middle of the room, which I'd rather not do.

Btw, both speakers are 150RMS and I'm running an Onoyo 805...

Basically I'm just worried about the speakers being to high. Thanks!