Here's an article on this subject from the November 2004 issue of Airforces Monthly. I'm getting it from the magazine so can't provide a URL, but anyone can go look at the magazine (if available), the article's on page 19.
F-16 Plus One
PAKISTAN is pursuing an advanced fighter acquisition programme that it hopes will include the Lockheed Martin F-16 plus one other fighter for the Pakistan Air Force (PAF). Already well into discussions with Washington to obtain Mid-Life Upgrade level upgrades for it's existing F-16's, at the show, (IDEAS 2004) Air Chief Marshall Kaleem Saadat of the PAF noted that Pakistan would like 70 more, but so far, Pakistan has only sent a letter of request to the US for 18 more F-16's.
This move conveys some Pakistani confidence of gaining approval, a sure sign of how US-Pakistani relations have improved since the war on terror. Saadat told AFM that the PAF would prefer the Block 52 model and a commensurate weapons package, to include AIM-120 AMRAAM air to air missiles, and JDAM precision-guided munitions. Other sources note that if finances do not allow for additional Block 52's, Pakistan may purchase used F-16's.
-ends-
As you can see guys, PAF clearly prefers F-16's to it's other fighter choices. It will be acquiring JF-17 and possibly another "advanced aircraft" to round out it's fighter forces, but it clearly wants the F-16 to be the mainstay of it's forces. This can only be because of it's capability.