I personally just use the standard head type, but rather than the T-handle driver, I prefer 3/8" sockets. Attach to ratchet or driver as needed and have more options (just be careful not to use god-force torque when tightening with a ratchet).

Non-ball, 6-piece $30
http://www.sears.com/shc/s/p_10153_1...ord=hex+socket

Ball (long version), 6-piece $50
http://www.sears.com/shc/s/p_10153_1...ord=hex+socket