I'm with Gonk. I think you can audition the Outlaws and the Aperions in your home for 30 days for very little $$$. The Aperions will even ship back for free. The RF-83 are similar to my front L/R RF-82s. They are very efficient and do not need much power at all to drive them to a very high SPL. I would try to match the efficiency of the new speakers close to the old ones to level the sound field somewhat.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner