I've been running a zapco reference 200.2 for a few months now and love it. Its running a set of mb quart qsc216 comps and a set of boston type m tweets in the pillars and it does really well. Zapcos site only rates it at 50 per channel rms but the birthsheet on the amp showed 275 watts bridged at 4 ohms. So they are pretty underated. They go on ebay used for really reasonable prices. They also use the symbilink which gives your a really good signal to the amp as well.