My HT system is comprised primarily of Vandy speakers -- only the rear surrounds are a different brand (M&K SS-150 THX), which I chose mainly due to space limitations. Given that the Vandy VLR's are not truly full-range (as I recall, the rolloff starts at about 64 Hz), and reproduce mainly ambient information, my personal opinion is that it does make a lot of sense to spend mega-bucks on speaker cables for the rear surrounds.
One of the primary issues in choosing cabling for the rear surrounds is the length of the wiring. My rear surrounds needed about 35 feet of cable, so I originally chose some $1 per foot, 12-gauge Monster Cable that is wrapped in a Romex-style jacket. Then, about 18 months ago, I decided to upgrade the rear surrounds' cabling to Kimber 4TC. To be honest, I can't tell any difference in my system between the Monster and the Kimber cables. As the disclaimers in ads like to say, "your mileage may differ", but my best suggestion is to start out with a decent quality, 12-14 gauge cable (such as the Monster, or maybe Kimber 4PR) and see if they are satisfactory to you.
One of the primary issues in choosing cabling for the rear surrounds is the length of the wiring. My rear surrounds needed about 35 feet of cable, so I originally chose some $1 per foot, 12-gauge Monster Cable that is wrapped in a Romex-style jacket. Then, about 18 months ago, I decided to upgrade the rear surrounds' cabling to Kimber 4TC. To be honest, I can't tell any difference in my system between the Monster and the Kimber cables. As the disclaimers in ads like to say, "your mileage may differ", but my best suggestion is to start out with a decent quality, 12-14 gauge cable (such as the Monster, or maybe Kimber 4PR) and see if they are satisfactory to you.