In this specific circumstance since you're already supplementing with THE BEST (Need 2 Guard) I would suggest still going with a Multi, but save money as much as possible. What I always recommend in these types of situations would be to get the Sam's Club "Member's Mark" multi for men, it's very comprehensive and will save you a LOT of money while supplying the missing links in your overall vitamin requirements. If you don't have a Sam's Club nearby, or a membership, the same thing can be easily purchased at Wal-Mart.
Luckily, vitamins are inexpensive... Need 2 Guard, with it's myriad of rejuvenating and health bolstering additives, is not. Both, however, should be used and relied up in concert