Bare wire or spades.
I hate banana plugs because of the stress they put on the terminals. I need to try out some right angle bananas, which should reduce the problem.
I've been running Clearview Golden Helix cables from Mapleshade for the past few months and have been very impressed. Contrary to everything I've heard about speaker cables, they are very thin (maybe 14 AWG), solid (not stranded), silver plated copper. Mapleshade claims that they out-perform cables costing 20 times as much, but they puff their products relentlessly. Still, you can't go too far wrong for $85 (with a money back guarantee).