Oh man, don't use a juicer. You'll regret it, it'll take way too long and be too much work! What part of the country do you live? If you live in Apple growing country, try to find a press at a farm that will do your apples or an independent one.
I go to a local press, did about 9 bu, got over 25 gallons, I think (not exactly sure)...I might have posted it a while back. The thing is with a press, the more you fill it the better your yield, at least with a big press. Dunno about the small hand crank ones, but I imagine it would be true to a degree as well.