Can you give me prices for both the single and double boxes with the 10tw3 subs. If I go with 2 subs, I would likely go with the HD 600/4 to drive the fronts and rears and the HD 750/1 to drive the subs. Does this sound feasible? Also, if I go with the single sub, I'm guessing that the HD 900/5 would be too much for the single sub....is this true? Lastly, can you give me a rough time frame for getting a box made? Thanks again for all the help.