I am attempting to remove the top nuts on the forks of my 1150GS so that I can drop the forks and re-route the brake line and cables for a ROX riser installation. I can't break the nuts with my 6 inch ratchet so I either have to get a breaker bar or an impact wrench. Are there any recommendations here? The torque value for the nuts is 40lbs. They may be over tightened or be some degree of seized up.

I went to Sears today and all they seemed to have were impact wrenches. What would be best, a 2 ft breaker bar or a plug in electric impact wrench? Any brand recommendations?