X-15 MPM (1/72), Special Hobby (1/48), XB-70 AMT, P-51, H-1 ? don;t know maybe there's a vac kit?, SR-71 testors Italeri (reasonbly good) U-2 Testors/Italeri, S-3 1/72 Hasegawa (reissued by Revell) 1/48 esci/italeri, F-22 there is no accurate kit.
Of all these kits, the P-51 by Tamiya is very good, the others ones are reasonble. As for the X-15, it's short run so quite difficult.
For the best anwsers for these kind ofquestions, try the aircraft forum.
And, off course,
to the forum