Best used solid state amp for Energy C8 1500 Max

My left and right mains are Energy C8's. These speakers handle a max wattage of 300 at 8 ohms and 93db room efficiency. The impedance range is listed as 8 ohms nominal - 4.5 ohms minimal. The Frequency responce is 28Hz - 25KHz(+/-3db). My listening room has dimensions of 17 feet wide and 19 feet long with a 10 foot ceiling. My preamplifier is a B&K AVP-3090 and I use Monster M550I interconnects. My CD/DVD transport is a Pioneer DV-414. I listen to primarily large orchestral music that emphasizes Brass. I am a tuba player so I am very critical when it comes to bass. I also want a solid state amp that has a nuetral to slightly warm midrange and treble. Prefering more of a warm sounding trebel and midrange. I have narrowed my choices down to a B & k Reference 2220, Bryston 4B-ST, Aragon 8008BB, Classe CA-200, Sunfire Stereo Amp (300 Watt), Rotel RB-1090. Since I must buy this amp used there is no way that I can audition these amps in my system. I like the Bryston's 20 year transferable warranty, but if it is going to sound cold in my system I do not want it. Which amp would you recommend?