I have to chime in here...
By far the best wire supplier that I've found has been
http://www.apexjr.com
I buy all of my Teflon jacketed wire from them. Teflon jacketed wire does'nt melt under the soldering iron (at all). Has a smaller diameter due to the thinner jacket and has a higher over all max temp rating. And his prices are much better than the rest of the telfon wire suppliers out there that I've found.
His single conductor shielded wire is great too... for those of you that ever need signal shielding.