Really, for a limited plane airforce, the Su-27 is a better choice than the F-16. The F-16 is a single pilot, single engine aircraft. With the Su-27, you get two crew, two engines, a powerful radar, and lots of wing area. Its really the equivalent of the F-15. Perhaps a bit better due to the two crew members.
The latest F-16s (built for the Israelis) have a very high wingloading, are jammed packed with electronic gear, have huge external conformal fuel tanks, and are two-seaters.