I'm thinking about getting a Mesa Powerhouse 212 but I can't decide if I want the 8 ohm or the 4 ohm. I don't really think I will be getting another cab because I don't want to haul around that much gear, but I guess I could alway change my mind down the road. My question is how much different will the 8 ohm sound from the 4 ohm? Will there be a noticable diffence in power and volume between the two? Also, I'm using a Gallien Krueger 800RB which I've heard sounds great running at 4 ohms but I've never had the opportunity because I'm currently using an SVT115EN. Thanks in advance.