Chains... Shimano DA/XTR bought on sale or other 'better' chains from Shimano (Ultegra/XT) or SRAM.
Superlinks...
I've used Forster SuperLink / re-useable links for the last 10 years as well as the SRAM PowerLinks (because the latter came with new chains) and the Superlinks are, well, super.
The SuperLink III (Green Card) works with 10spd; SuperLink II (Pink Card) works with 8/9 speed, SuperLink I (Yellow Card) works with 8/7 speed, but are hard to find.
They are available at Branford bike for $9.98/ea (ouch).
http://www.branfordbike.com/chains/chains4.html#item5
Or you can save $3 or $4 by buying them from Lickton's:
http://www.lickbike.com/productpage....9;0338-10'