Years ago, I started taking a multivitamin that was made by Safeway. I chose it because it was high in some of the B vitamins, which I wanted, but not too high in the A (it's not good to take too much A), and because it had a bunch of extra stuff -- a bit of ginko, some grape seed extract, a whole bunch of minerals -- that I thought would be good to take.
Then Safeway stopped making it! I was disappointed, but then I looked around and found that Walgreens made vitamins that had the exact same formula (even though they were packaged under a different name)! So I've been buying it there ever since.
Somewhere along the way, I passed 50, and I "graduated" from the regular UltraChoice formula to their "Mature" formula. There is a lot of overlap between the two, with a few differences. One difference that I think is important is that the "Mature" doesn't have iron. That's important because from what I've read, men and post-menopausal women shouldn't take any supplemental iron.
These vitamins are very inexpensive. If you buy the big bottle, it costs about 5 and a half cents per day. Some of the upscale vitamin brands costs far more, but I haven't seen anything that's convinced me that they work any better.