In the UK, the Orange 2x12 probably best meets your needs as a cab - but you might not particularly get on with the V30's loaded in it. Some guys seem to love V30's for metal, some don't.
Roobubba swears by his G12K-100's for his down-tuned metal. I had a G12K-100 in a 1x12 a while back, and was very impressed with it - a very balanced and solid speaker, able to take some real punishment and a lot of wattage, also with a great bottom end.
So, in summary, I'd get an Orange 2x12 - sell the V30's in it, and replace with G12K-100's.