Just about to order a v30, is there any difference tone wise between the 16ohm and 8ohm version? the cab i have is loaded with 16ohm speakers, as im only ordering one (for micing purposes) would it mean i'd have to buy the 16ohm version to match the rest of the speakers? Also, how much difference is there between the v30 and the gt75? will the results be better for recording? cheers.