I have to agree with Shawn about some wide small game heads hanging up while shooting through brush (where rabbits like to hide). That's one of the reasons, despite being great stump-shootig heads, I've never liked Judos for rabbit hunting.
Ideally, you want a head that is narrow enough to slip through brush, but deadly enough to quickly dispatch your quarry. Being inexpensive it a bonus too, especially when there's snow on the round.
Old broadheads are nice (they'll kind of cut through brush instead of hanging up), but I generally opt for Ace Hex Heads, which are about $9 for 6.