LJ, welcome. You'd be wise to disregard any nonsense that you may have read about amplifiers in receivers having "bright", "warm" etc. characteristics. Competent engineers design amplifiers to amplify transparently within their designed power limits, with audibly flat frequency response and inaudibly low noise and distortion. For an amplifier to add an audible sonic character to the sound(with its controls for sound processing not in use)would require a substantial deviation from flat frequency response which simply doesn't exist. Blind listening tests have failed to show any of these claimed characteristics; once the nameplates and pricetags disappeared, so did the differences.
If the features of the Onkyo 705 are attractive to you and it fits your budget, it would be an excellent choice for your system.
