If you want to go the unregulated route, definitely get a parallel box. You can build one for about $30-$40 or find one on ebay at about $10-$20 more, just make sure it has a mosfet or pick up a full mechanical box. If you didn't already know parallel batteries splits the amp load between the batteries and also decreases voltage drop, making it quite a bit safer to go down to .1 if you plan to go that low. Also, always use 30a batteries or better if you plan to do any sub ohming.