I had some time to kill the other day and ran some rough numbers (prices include development that's already been done, some prices are in 98' dollars [15E, B-1, F-16 C/D, 117] , some are foreign buys so more expensive, some cited from Wiki, etc.). Also it's impossible to estimate exactly how much it would cost to build some of the legacy aircraft, i.e. the BUFF, A-10. Regardless, it helps put an unfathomably large number into perspective and gives a frame of reference for exactly how "affordable" the JSF is.
JSF- Estimated total cost 329+ billion for 2,500 aircraft and rising. That would buy us roughly-
B-2 @ 1 bil- 329
B-1B @ 238 mil- 1,638
F-22 @ 120 mil- 2,741
F-117 @ 110 mil-2,990
F-15 S/E @ 100 mil- 3,290
Block 60 Viper @ 80 mil- 4,112
Rafale @ 70 mil- 4,700
Eurofighter @ 63 mil- 5,221
SAAB JAS 39 @ 50 mil- 6,581
Rhino @ 43 mil-7,651
F-15E @ 31 mil- 12,580
Block 40 Viper @ 20 mil- 19,500
That doesn't factor in discounts for order size either. Boeing was willing to knock off something like 10 mil per plane for the additional 124 Rhinos, so imagine how calling them for 12,580 F-15E's would go. I think they could make the 98' price work.
Anyone want to take odds on 20,000 F-16 C/D's vs. 2,500 F-35's?