Call Dan’s Competition (they’ve got a website) and tell them your height. They should be able to hook you up. You can either buy a complete bike or get one built up from parts (more expensive). If you’ve got money to burn, a Fit, S&M, or Standard can be nice. If you don’t want to waste as much money, a less expensive Fit complete would also be good. If you’re taller, a 20.5-21" top tube might be good, if you’re shorter, a 20" would be nice. All the bikes today are 10x stronger than they were when you were a kid, so no fear on that count.
Light is the trend nowadays, but it can get ridiculous (and expensive). Expect a decent bike to cost $300-$500, a really nice one $600 and up. Usually as you pay more money you’ll get better, lighter wheels, nicer cranks and pedals, and your bike will magically get lighter.
Look on Ebay for completes, too. You can usually score one for less from some kid whose parents bought it for him and he quit. I built a Fit Series one from parts, including scoring the frame for $50 used from a friend. Compare that to $300+ new.
I would really recommend that you get hubs with a 14mm rear axle if you’re a grown-up. They take a beating. The extra weight of a 14mm front axle won’t hurt you, either. Good luck. And expect your wife to tell you to “grow up”. BT, DT.