Actually an MQ-9 Reaper purchase is going to be nowhere near the cost of an F-16 Block 52 (current production model) acquisition.
Consider Italy's DSCA request for 4x MQ-9 Reaper:
http://www.dsca.mil/pressreleases/36-b/2008/Italy_08-60.pdf
Now it's horses for courses, you'll pay more for a squadron of F-16's than a squadron of MQ-9's but you'll get far more multi-role capability from a squadron of F-16's as well.
For an armed force of 4-5x MQ-9 Reapers, a weapons package (Hellfire and Paveway II / Enhanced Paveway II) plus an initial 5 year support package, you'd be looking at about $350m - $400m.
You're not going to get much F-16 capability for that...