There are lots of plans on the table.

See for instance
http://www.socialsecurity.org/pubs/ssps/ssp-32es.html
http://www.house.gov/ryan/Summary_Ry...perity_Act.htm
http://www.house.gov/apps/list/press.../040722ss.html

On the latter, you can see more information here:
http://www.granitetower.net/sscalc.html

__________________
None love freedom heartily, but good men; others love not freedom, but license.
- John Milton