Hey all, I want to trade my Ampeg BA115 that is in good condition for a gently used GK MB115. I'm sure I can get a guarantee on quality for the trade and have a warranty. He wants the Ampeg + $130. I think this is a little much as both amps are pretty comparable in price. What would you recommend I do? I feel the Ampeg + $50 would be more like it. He's selling the GK for $300. thanks guys.