What Lion maintenance utility should I use?
Onyx
I don't know AppleJack, therefore I don't know if this program is sufficient for your needs. Onyx is a free tool for general system maintenance.

You can automize tasks which you do frequently.

Verify the Startup Disk and the structure of its System files, to run misc. tasks of system maintenance

Delete caches, to remove a certain number of files and folders that may become cumbersome, and more.