I cannot offer much of a suggestion on Marshall or Orange. I bought my RA100 on Ebay. So I did not have a chance to experiment with it before I bought it. Shortly thereafter committing to a bid, I found a guitar shop 3 hours away that carried Mesa Boogie. Since the dropping of GC by Mesa, I now have to drive way out of my way to test drive an amp if I am shopping for Mesa Boogie. As it turns out, the shop had 3 RA100's in stock. 1 Head and 2 Combo's. I took the drive down just for the experience (in case I got outbid was it worth to pursue). The Head I tried out was though an Orange straight 412. It sounded okay. I won the bid, and got the amp. Did not sound all that great with my Recto cab (removed the V30 in favor of EVM12L) Based on recommendations from others here, I shopped around for a smaller 412 cabinet. I was on a budget since I already had 4-V30's so it did not matter what the impedance of the cabinet was. Found a good deal on a new Egnator cab (similar size to the small Marshall) Swapped the 16ohmn 75 classics with the 8 ohm V30' and could not be happier. I had a strong bias against V30 since I did not care for them in the larger Mesa Cab. But once they are in a smaller sized cabinet they sound perfect. Seems the RA100 works well with the V30. Go figure. I still do not like them with the Mark V (EVM12L is a better choice, also with the Mark IV as an extension cab the EV wins, but the 412 with the V30 is not bad).
