*I was trying to think of a good two-hander, forgot about Steeldriver...
Yes, an interruptable attack and 0 defense doesn't really lend itself to blocking - that doesn't mean you can't use a one-hander though. You could use a low-block shield with useful mods (Rhyme for CBF and res), something like Spirit (FCR and +mana is nice for War Cry) or you can just equip a fast base weapon in the off-hand slot to speed up your attack:
When using Butcher's , equipping a Cutlass [-30] offhand does a lot for your IAS breakpoints:
^Same breakpoints apply if you decide to use the Oath SC.
FPA Cleaver Cleaver/Cutlass
11 70 30
10 105 52
9 174 89
IMO in norm and NM two-handers are generally too slow to justify the extra damage. Oath in a fast base is another story. I quite like Highland Blade and Champion Sword as bases as they're speedy and give you the option to go one-handed. Oath is end-game, if you want to do better you're looking at Death, Grief and BotD