I hate the coiling cable locks. They're hard to get around your bike, and they scratch it too. I have one like this I got at Lowes:

http://www.kryptonite.com/Products/P...=1001&pid=1130

I think mine is not as beefy and was maybe $28. Kryptonite has so many choices, both in cable width as well as length. Decide what you want and find the model.

Mine coils up into about a 12-15" circle which fits in my smallish messenger bag. Mine is a 6' though, so a 4' might coil up smaller. Once uncoiled, it's completely straight. 6' is more than you need though, 5' would probably be enough to get both wheels, frame and a nice pole. I put my helmet through mine too.