I'm currently running a BL 600 with an Avatar 112 and a beat up old Hartke 15". Thinking of replacing the Hartke in the next few months with another 15". I don't want anything too heavy -- probably 45-50 pounds max. Some I'm looking at: GK 115MBE GK Neo 115-III GK 115MBX Ampeg PF-115HE Portaflex Bag End S-15D And there are probably a hundred others in the $300-$500 range. Has anyone listened to more than one of these for comparison purposes?