Comparison costs

Given today's SS1 flight, I'm interested in relevant comparison costs. Not
that these projects are appropriate benchmarks, but does anyone have figures
for the cost of the Mercury program (from conception to first flight) and
the X-15 program (from inception to first flight) - in today's dollars?
Seems to me I recall the X-15 program as a whole running about $200 million
in 196? dollars. No?

Can anyone think of another more valid government program to compare
against?

Jon