As I seek to create a more modular system, I'm in the market for a used amp head. Has anyone compared the two side by side? Does anyone prefer Eden over SWR or vice-versa? Has anyone tried any of these with Avatar cabs? I'm sure that Ampeg, EA and others make a fine amp, but I am trying to stay in the under $500 range for a tube preamp head that pumps out at least 300 @ 4Ohms, 200 @ 8Ohms and weighs in at under 20lbs. Any thoughts?