I would seriously recommend one of these;
http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail/0,,CNTID%253D450962%2526CTID%253D227800,00.html
I've got the earlier EMX5000-12 and it is great!
Real, true stereo is the only way to go! Plus the 6 built-in compressors come in handy......
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An arranger is just a tool. What matters is what you build with it..!