These are absolutely my favorite banana plugs to work with.
http://www.cablestogo.com/product.asp?cat_id=412&sku=29785
$3.00 for a package of 4 plugs (one speaker, both ends!) and they use two screw down connectors for wire up to 12 gauge. I use mostly 16 gauge with them and as hard as I pull on them, the cable doesn't budget. Rock solid connection, easy to install, gold plated quality, and plastic shielding to help prevent shorts.
Three bucks! I ordered about 15 packs of 4 recently - well worth the 45 bucks I paid.