Just "invested" in a spool of 16 gauge wire from RatShack.... total came out to just under $10.
Surprising to me (it was a pleasant surprise) it actually made a difference in the sound of my system. It was an overall improvement. I listened to it with the old stuff on while I was making the new cables, then switched them around as quickly as possible and listened to the same stuff as before. The bass is a little sharper... less muddled, and the highs are just clearer.
Before, I was using a nasty mix of gauges of RatShack wire of different lengths all spliced together and creating a wonderful nest of cables behind my receiver. For this job, I made sure that the runs to the two MAs were of equal length, and the runs to the Polks were equal. The MAs and the Polks are very, very close to being the same wire length, tho the Polks are slightly longer. I figured it wouldn't matter since the two pairs of speakers are on different outputs.
Overall, I'm impressed.... I didn't think I'd get much of a sound difference. I only did it because my system looked horrible. I guess the wire quality was just bad overall.