Buy the heavy bastard sword, then join a server (say a duel server).
Look at the equip screen, select the heavy bastard sword to be in slot one, and hover your mouse over the heavy bastard sword. You will see every mode and all the stats for each mode. You will lose a wee bit of each, but have killer reach (better off using an arabian cavalry sword though).
And yes, you can use it in one hand.