I would pass Monster right on up. Sure, they are better than "box" cables, but better can be had for about the same amount of scratch.
At the lower end price point, look into XLO cables.
www.xloelectric.com
A step higher, go for Kimber...
www.kimberkable.com
And top of the heap... Transparent... the stuff that my wet dreams are made of...
www.transparentcable.com
Both Kimber and Transparent have cables ranging from $75 to $29,750 for an 8 ft. pair of Transparent Opus MM speaker cables. There is something for every price point.
Cables are the most overlooked part of a music system. A system is only as good as its weakest link. A $4000 THX Ultra2 Certified receiver will sound like a piece of shit when you run it through a pair of cheap cables.
Good quality sub cables will make a world of difference. A sub is all about acoustic energy, so the more current you can pass through a cable, the more impact you sub will have.