Maybe the best thing for you to do is try it yourself. As a experiment you could pick up some standard 12 AWG speaker wire and compare using single wire and biwire. (Use a short length of 12awg as a jumper for the single wire.) If you find bi-wiring works in your system the second choice is how much do you want to spend. If you cannot currently afford the cables you want, start with a single pair and then save up for the second pair for biwiring. This assumes you do not mind having two cables running to your speakers. The combined biwire cables are a cleaner package. Some people use a different cable for the high and low drivers. (MIT biwire cables actually have the cables marked for high and low frequency.) I do biwire my B&W speakers with good results. Happy listening.
Biwiring
Having recently purchased some B & W speakers, I was told that the manufactuer recommended biwiring so that's the route I took. I'm sure there are lots of opinions as to whether biwiring adds any real benefit. I'm thinking about upgrading speaker cables and was wondering if I would be just as well off going with better quality single runs and utilizing jumpers at the binding posts ?