I'd like to upgrade my speaker wire

Agree on larger-than-14 guage wire needed for very long runs!

IDEA: Try to re-do the set-up so you can get shorter better-sounding and a bit pricier speaker wire. Various audiophile speaker wire types DO, ABSOLUTELY DO sound different...and some WILL synch with your system better than others ( so try various types before you buy - borrow from a friend for a day...or from a store BEFORE buying). Me? I’m partial to Tara Labs RSC Prime wire out there used for $100 - $200 for 10’ to 15’ on the used market. FABULOUS clarity and power!
NOTE: RSC stands for "Rectangular Solid Core"....not sure what guage but these copper wires are pretty thick and not round but rectangular ....whatever the blurb- it sounds leaps and bounds better than some plain wimpy-sounding DIY 12-guage stranded copper wire i had been using before.

Millercarbon - lose the scare quotes!

Good advice, thanks.  Doug

I utilized this diy for a set of short run speaker wires. My opinion was favorable enough to bench the audioquest wires. If u have access to a wire stripper, definitely recommend.  Adjust your gauge of wire and length accordingly.

http://www.6moons.com/audioreviews/whitelightning/moonshine.html

Try DNM Resolution. Designed for longer runs. Contrary to most opinions here these are very small thin wires but they sound really, really good.I run 23ft of these under the carpet of my living room to the speakers  on the far wall and they sound better than stranded Kimber wires I've tried. Order direct from their  website and well within your budget