Armando-
Just find a Monster dealer and order the total length you need. You can biwire if that strikes your fancy, or let the dealer do it for you (a little soldering involved and if you're not handy with an iron, better let the dealer do it.)
The Signature stuff is usally available at high-end shops (think it goes for around 70cents/foot. Again, order the length you need, cut if for the three runs you're going to make, and connect accordingly. Drop me a line if you need more help.
Cheers