With your size, you will have a difficult time finding anything off the shelf that fits properly. I to am 6'4" 200 lbs. I have been through tons of leathers and finding a proper fit is almost impossible. The pants are to short in the legs if they fit in the waist (34 in waist).
I purchased a Taichi one piece suit in size 44 and they were wearable but was to short through the torso. I took them to our local Russian leather taylor and he lengthened the torso by two inches and they now fit perfectly. Unless I get back on the crashing wagon, I think they will last me as long as I ride.
I'd suggest you go to a big shop where you can try on many different suits. My just find something that fits. I may nention, I took one of my friends to Cycle Gear who is just over 6' tall and 270 lbs. He came away with a two piece Frank Thomas leathers and the fit him pretty dang well.