I'm planning on buying either a Crown XLS 402 or a QSC 850 and pair them to two Avatar cabs. (two 210's or 210+115). I play a Lakland 55-01 5 string and play all types of music. My pre-amp will be my SansAmp BD. Crown XLS 402: - 2 x 570w at 2 ohms - 2 x 400w at 4 ohms - 2 x 260w at 8 ohms - 800w at ohms bridged mono - 3U rackmount - 31 lbs - THD less han 0.15% - aprox. $280 QSC 850: - 2 x 430w at 2 ohms - 2 x 300w at 4 ohms - 2 x 200w at 8 ohms - 600w brigdeg mono at 8ohms - 830w brdged mono at 4 ohms - 35 lbs - 2U rackm. - THD less that 0.01 - $300 The Crown is cheaper with more power, but 3U. The QSC has less power but has less THD, is only 2U and can work 2ohm loads in mono. Since I'm gonna buy the Avatars I need some help. The 210 can be ordered in 8 or 4ohms. The 115 is 8 ohm. If I decide on the 210+115 setup, I'd probably have to buy an amp that provides enough power at 8ohms (in stereo) but if I buy two 210's I'd get them both 4ohm. So, would It be best to buy the 210 and 115 in 8ohm so they get the same amount of power? Or will two 210's work equally or better ??? Please tell me your opinions about these two amps, quality and soundwise. Which one's better? Aby help is very welcome.