Revel Salon 2 vs. B&W 800D - Compare and Contrast

I'm trying to put together my first great Stereo and I'm focusing on which speakers to center it around. My listening room will is 4,500 sq/ft.

Please help me compare and contrast the B&W 800Ds with the Revel Ultima Salon2s.

Here are some basics to start with:
Sensitivity
Revel: 86.4dB
B&W: 90dB

Size
Revel: 14" x 53.25" x 23 "
B&W: 17.7" x46.5" x 25.4"

Price:
B&W: $23,000
Revel: $22,000

I heard the B&W 800D speakers last week (as mentioned on my recent post about the Beobab 5 speakers). I was deeply impressed. This Friday I hope to audition the Revel Revel Ultima Salon2s.

What differences should I look for?
Note: I will be picking some kind of solid state amplifier