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Teflon jacketed wire is often available on eBay, in short surplus lengths. This is extremely expensive wire, often silverplated or with high silver content. I don't think that there is anything better - it's often used in hi-rel/military applications. Beware, don't melt the insulation with a soldering iron, the fumes are poisonous, particularly to birds.
On the gauges, European wire is usually sized in cross-section mm's, US is some old English standard. My 107CD has a handy cross-reference.
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