Just as an aside and to add my two cents, I'm running RTi12s as mains off an Onkyo 605 with zero problems (no fatiguing, no distortion at our comfort levels, no shrillness, etc.). The RTis/RTi As can pretty much be run with any AVR from my experience; it's when you get into the LSis that there are issues with higher power and better amplification needs due to their low impedances/quasi-low efficiency...
5.1: ONKYO TX-SR605B - oppo BDP-83 - SONY KDS-50A2020 SXRD
Mains: polkaudio RTi12 - Center: polkaudio CSi30 - Surrounds: SpeakerCraft Preinstalled In-Ceiling - Sub: polkaudio PSW350 - Auralex Acoustics SubDude - MONSTER PowerCenter HT700
2-CHANNEL: ONKYO TX-8555 - marantz CC4001 - TASCAM CD-RW900SL PROFESSIONAL - Numark CDMIX 1 PROFESSIONAL
Infinity BY HARMAN PRIMUS P363BK - audio-technica AT-LP120-USB PROFESSIONAL - Bell'O AT423T Audio Tower