Not impressed that much, on http://bitcoinvanitygen.com/ u can get 9 (!) letters non case sensitive and 7 letters case sensitive easy with couple clicks.
To be honest for me this longest addresses are quite expensive but probably not for everyone.

You must consider difficulty of address by couple factors, not only lenght but if it has numbers in it and if it is case sensitive which changes everything from my tests.

My address: 1veLkroTLLvky76tJEKr2VmEpEPtdjkJZ (im unlucky coz i can't get all same lower case letters or all upper case letters because of how bitcoin addresses are made)