Another level of Monk would give +1 to all saving throws. The Slow Fall probably wouldn't hurt either.
Another two levels of Fighter would do also give +1 to all saves and give you another feat.
Doing this gives you +3 BAB.
The other option is go Cleric and pick up a good domain. This allows you to use the (hopefully) good Wis of the Monk and pump your abilities a little bit. Personally, I would go +2 Fi/+1 Monk instead.
Another two levels of Fighter would do also give +1 to all saves and give you another feat.
Doing this gives you +3 BAB.
The other option is go Cleric and pick up a good domain. This allows you to use the (hopefully) good Wis of the Monk and pump your abilities a little bit. Personally, I would go +2 Fi/+1 Monk instead.