I am shopping around for a new amp for my SWR WM 1X15 & 2x10 cabs. These babies are rated at 200 watts each @8ohms. I was looking at the HA5000 and the WM4004 as possible amps. The Harkte is "bi-ampable", which seems like a neat feature. The 4004 is the SWR amp which is marketed to be mated with the WM cabs. Any thoughts out there on which would be best? Any other suggestions?