Despite what some people on this thread are saying, no, Pakistan was not stopped by the US at getting the F-15. PAF simply has had no desire for it, as it is a defensive force by nature. It has, to my knowledge, never expressed any desire to add heavy fighters to it's fleet.
Right now, PAF is upgrading it's F-16s to blk 52 standard, which is more than enough to deter any aggression by foreign forces, including India with it's Su-30MKIs. The force is also continuing to develop the thunder project, so as to build it's domestic capabilities, and from what I can tell, Pakistan is trying to domestic the fighter more and more.
As for a future fighter, PAF will probably jump straight to a 5th gen when it seems that India is going to get it's own 5th gen. There is no need to get Eurofighters, Rafales, or any other such fighters.