Cable confusion?

The only absolutes in speaker cables are:
(1) Keep them as short as possible;
(2) Try them in your system ... listen and compare.
You are not running high current through a speaker cable, but relatively low voltage, so heavy gauge wire is not necessarily the answer. The quality of the wire, the coating which encloses the wire, its running pattern, the connectors, and the solder joints make far more difference than the gauge of the wire.
Also, brand name makes very little difference in your system. You can't hear brand name! Even in a given brand line of cables, there will be big differences in sound between different models.
There are small companies ... individuals ... who can produce very good sounding cables, and at reasonable prices. Very few cable companies are extruding their own wire ... most of them buy the coated wire and then make their cables. What they do with it makes a lot of difference in the resulting sound. You can hear every solder joint ... so the quality of solder, and the quality of soldering can be heard.
So, I would suggest that you talk with dealers who sell the components that you have, and hopefully get educated and honest recommendations. Then try a couple of recommendations against what you already have. Use a good CD or record ... one that sounds close to live ... and play that reference source over and over while changing the cables in and out. Shut you eyes and picture the soundstage in front of you.
Buy what sounds good in your system! You are not buying brand names or gauge ... you are buying sound!

Just to add to what has already been sais: generally for speakers cables, a larger cable is better if you need a long runs. At least 12awg.

A lower gauge(thicker wire) means lower per/length resistance but larger per/length capacitance. A capacitance load for large amps(>60W/ch) usualy will not create any problem. For poweramps >150W/ch I would recommend a minimum of 12AWG

A higher gauge means higher per/length resistance. Usually high-end or even professional audio brands provide all paramenters for the cable or wire. Monster doesn't and I can't tell why.

A short runs of speaker cables or wires will benefit in all cases: low overall resistance and capacitance at once.

If you go to the VanDenHul gauge/ampere/ chart you will know how to calculate the current flowiing through your wires and the gauge neccessary to conduct such current with minimal loss.

I use a 1m short run of 14AWG for my VTL MB100(100W/ch).

I'll dare to rephrase Skooks: Use a CD of a music You love the most to all your auditions.