I liked the V30 clip, but the G12H-30 clip had a bit more clarity, but with some of the same characteristics of the V30 that I liked.

Going on what Lats said about Ampeg's doing better with a flatter sounding speaker, you might want to look into something like an Eminence Delta Pro, EV12M (out of production), or the Weber Michigan. Each of those speakers are supposed to be similar in tone (according to hear say, not personal experience). They are made to have a relatavily flat response, and high power handling.

BTW, do you have any pictures of this amp?

@Lats... if you ever run accross a good deal on a V series head, let me know. I've been dying to get my hands on one. I've got my channel switches and all. Now, it's time for a single channel tone monster *evil grin* :D