if you decide to go 3/4 get one of these:
Mechanic’s Breaker Bar — 40in., Model# 67330 | Torque Wrenches | Northern Tool + Equipment
Wicked cool, very beefy. The size of most 3/4 breaker bars is waaay too short.
Snapon also sells a very long 1/2 breaker bar that is much longer than what you can find from Sears, etc. I've seen a few cheapie clones that looked pretty good too.
You might want to consider looking on ebay or flea markets for just the sizes that you need. Most of the set will sit there and collect dust. They are however useful as if you have a whole set, you'll likely have the right size to press in seals and bearings.