I just recently sold two Basses and I'm ready to purchase the Gallien Krueger Fusion 550 head that I've been wanting for a long time; Should I just go ahead and buy it now? or wait to sell my Genz Benz Streamliner 900 so I can A/B them to find out which one I REALLY like better? OR, (for all the Fusion 550 owners), Is it GUARANTEED that I'm going to like/love the Fusion 550 better so just go ahead and sell the GB Streamliner 900?