Let it be known that I want to make this
The Tu-2000 hypersonic space scramjet.

10 billion. 10 years.
Fully returnable spacecraft without a rocket. A transportation revolution in the making
Well, that aside, it will be cost-effective even if you only have 1 such craft and run it at less than $10 million per launch - the tempo can reach 20-25 launches per year, and it can lift up to 10 tons into orbit. This opens the path to rapid in-orbit spacecraft assembly, which is necessary for space colonization.
I'd like to see what other space agencies have in mind for interplanetary craft construction. We're a long way from even Mir-type habitats, but at least this craft, if built simultaneously with advancing space stations, can later give us the power to lift some 200-250 tons into orbit for less than $100 million over the course of one year.
The alternative is the now-made Vulcan-Energia, which is admittedly very cost-efficient and can lift 175 ton payloads in one launch, which would probably cost around $150 million (basing on the Energia's simple launch cost of $100-130 million). Admittedly, it's faster and easier.
But the scramjet, I want that and it... uh... offers unique military capabilities not offered by an Energia rocket
1 billion a year, if no one's up for a joint development, I'm still making it!
