In retrospect we should have bought the tigershark. It was the perfect mig 21 replacement. Heck it would beat the jf-17 too if it was inducted. An entire aerospace industry could have been built on the backs of the f-20. It filled the exact requirement for a mig 21 replacement. It could go mach 2.0 (which the lca could not) had decent bvr and we would have jumped a generation in radar tech long ago.
America wasn't a viable option for us 'cause ToT would have been extremely limited and we would have pissed off the SU in the process when we needed their help in developing a space and ballistic missile program.