My favorite connectors so far are the Oyaide Armored series - AC-004/AP-004. The only real downside is that they're only available in Japan, so need to order them through eBay. The 004 series have the same plating as the M1/F1, in a much less expensive package.
IeGO aren't bad either, but are pricey for what they are. I much prefer these to Furutech.

