So I'm building a 2x12 cab, and want to load them with V30s. I see that I can order V30s in either 8ohm, or 16 ohms. My amp (mesa rectoverb) has two 4 ohm outputs and 1 8 ohm output. I may end up building a second 2x12 cabinet, and would like to run both of them. What ohmage V30 should I go with, so I don't run into trouble later on when I build the second and want to use them both. thanks!