I haven't purchased an amp in over 11 years, so I'm a bit out of the loop. I currently own a GK RB800 and an Eden WT-500. The GK is my spare/backup amp. I like my GK, but tonewise, it can't hold a candle to the Eden. My buddy who plays bass in my old band has been borrowing my GK head for a few weeks. He was dead set on buying an Ampeg SVT-CL... Then he saw the price tag. In any event, he has been digging my old GK head, and now wants a GK of his own. I told him that the GK is nice, but for a little more money, he can get a nice hybrid amp (SS power amp/ Tube preamp). I've only owned two hybrid amps in my bass playing life (Eden WT-500 & SWR SM-400). Here's my question: What hybrid amp would be a good fit to power an SWR 2X10 and 1X15 in the $300-500 range? He is looking to buy used.