I'm thinking I may ditch my DB750 and Schroeder in the near future for something from the Berg IP series. I'm definitely still keeping my NV215, and I'm gonna find a Mesa D-180 for it, for some old-school, distorted, heavy bass. The IP would cover most everything else. I play rock, basically, but some slap, funk, etc. from time to time. I think the IP310 is what I want, but I'm not entirely sure. How does it compare to the IP112, with and without an extension cab? And how does an IP112 w/ an extension cab compare to the IP212? What should I go for?