Alright, I currently have a Crate Blue Voodoo 60w Tube Head with brand new Ruby 12ax7 and Tungsol 6L6 Tubes. I use it for mostly rock, a little heavier rock, and enjoy some bluesy sounds from time to time. The cabinet i use is a vintage Carvin V412. The speakers are old and probaby not THAT great. I would like to either add 4 new 12" speakers to the Carvin cabinet, OR build a 2x12 cabinet and add 2 new speakers. My budget for speakers is $200. A 2x12 would be nice, as its easier to lug around, but I concern with that is getting a good low end sound from it. Oversized is a possibility. I'm thinking 5/8" Birch? I also want to properly match speakers, wattage wise. What do you guys suggest I do?