First, you will want to use a shielded coaxial type cable. The most commonly available is RG-6 (used in all cableTV applications). Since RG-6 usually comes with F-connectors already attached, we look for F-to-RCA adapters. I find them fort under $4U.S. at a Radio Shack store.
Since many electronics come from Singapore assembly plants, however, it should be just as easy to find a coax cable in the local market, already terminated in RCA pins, in a length you need for your room.
In my house that is being built, the sub is wired with coax. I ordered the F-connectors to terminate the lines, and also a female to female F to RCA adapter. The adapter will go into a wall plate on either end of the cable. I'll use a regular rca to patch from receiver to wall and wall to sub.
While not a huge Monster fan, their better series of subwoofer cable is quite impressive IMHO. It is neutral color to be less obvious in long runs, well shielded, and good construction. As a bonus it is very flexible and has a small cross-section vs. stiffer coax you can't keep against a wall.