For neck straps, I had a Tamrac Boomerang which was nice and stretchy (neoprene) with a wide area around the neck. I am 6ft and it was long enough to technically put across my chest although the camera would not hang very low. However, this was more comfortable when moving about shooting birds and kept my camera closer to the ready position. It also has quick release clips which work with other Tamrac quick release attachments like the clips that you can hook to the D ring on some backpack straps.
However, I now use a BosStrap
BosStrap - Home Its like a Blackrapids except it does not have the padding and pouches (not really necessary in my opinion ) and the biggest difference is that it doesn't use the tripod socket which is why I chose it. You can also disconnect the strap and use the short strap that attaches to the camera as a hand strap. Plus, its cheaper!