Anyone using the newest version of this amp? 480W version? I've played on the older 400rb and it was LOUD! Much louder than the Eden WT300 I've been using. I'm thinking of buying the 700rb and an Avatar 410. I've heard a few negative things about GK customer service, but I think you'll hear bad reports on most large companies customer service eventually. What's your personal experience with the reliability of GK products. Would playing through an Avatar cab make a huge difference opposed to buying one of the GK 410 cabs? I know I wouldn't be able to bi-amp with the Avatars. How big a deal is that? The RBH is a little pricey, and I'm not sure the 410SBX comes in 4OHM. Thanks for any input.