The more I look, the harder it is to make a decision! I've narrowed my power amp search down to: 1) QSC RMX 1850HD - 40+ lbs - $429 plus shipping 2) QSC PLX 1602 - 20+ lbs - $549 3) Stewart World 1.2 - 11 lbs - $719 plus shipping The lighter the amp, the more $ it costs. The Stewart World looks good except I have read it runs very hot - nothing like thermal shut down in the the middle of a set. And I just read in another thread about QSC fans being noisy. Currently, my rack has a SVP-PRO, Korg Tuner, DBX 266 compressor. I'm driving an Ampeg PR1832HE cabinet which can be bi-amped. All I need is a crossover. Any thoughts?