I'm pretty much in the same predicament, which means that we MIGHT be VERY VERY distant cousins. (HI COUSIN!)
I found a woman as a common ancestor for both my parents, Joan de Braose, year 1280. Mother's side from her first marriage, Father's side from her second. (Mind-boggling, isn't it?) This leads both sides back to Henry II and earlier.
I do believe that jplalone is correct though. I've been trying to make sure that every individual is backed up by nice clear records and good research -- but I know that I just copied information from a few trees here and there. I'm not putting any bets on the info. until I document everybody.