I have a 1x12 semi open back cab from Avatar. Right now there is an 8 ohm V30 in there but I'm gassing for a Celestion Blue or Gold. If I go with one of these speakers which ohm rating would make more sense? 8 or 16? Which is more flexible? I also have an Avatar 2x12 with V30s in there so maybe at some point I'd get another blue or gold and put them in the 2x12. Oh and I plan on using the 1x12 with my AC15C1 (using as an external speaker) or TH30 head or VHT Special 6 Ultra head. Should I go with the Blue or Gold for these applications?