[hedgetrimmer]

We've got the Saturn V rockets and they work just fine getting things into space, including men on the moon. If they were good enough then they are still good now.

[hopespringseternal]

We've got the Saturn V rockets and they work just fine getting things into space, including men on the moon.

No, we don't have them anymore. Now, we could restart Saturn Vs with a lot of savings given that the engines are already designed, etc. But it wouldn't be trivial and a lot of things would need to be reengineered.

You could also try to make certain components reusable or go with nuclear upper stages, if you could work the politics out.