401k sounds pretty young. While I know he's not likely to do it, my single best financial decision was to pay off all my debts and say out of debt at a young age.

The peace of mind I now get from knowing I have money far outweighs the various ignorant comments I get from family, friends and (ex)girlfriends.

401k seems to have a pretty good nest-egg. Think how much better it would be without debt. The increased cash flow would allow you to get out from under the thumb of your parents, and really increase your net worth.