J-16 comes with lyulka clause and Private Russian objection to the export of the Chinese flanker offshoots.
Unlikely, the Mig-35 is currently being pushed to India and is still a little overlapping with F-16s and JF-17s. If is medium size we want something with western sophistication or reliability like the EF, otherwise if we are going to end up spending money on buying and operating a third platform; it either has to be potent enough(Su-35) to justify the initial(and continuing) expenses or affordable enough(J-10) so we can throw more of them into a fight.
It will ultimately boil down to the J-10, Su-30SME and Typhoon T3.
Although the Su-35 is a great platform, I fear its integrated nature (while good) may make it difficult for the PAF to feasibly customize. It would be done, but in the end the PAF won't have that many units (relative to the fighter's expected availability rate). Moreover, because it is a Russian platform, it is unlikely that the PAF will be able to mesh the Su-35s with the F-16s for certain offensive operations, such as deep-strike.
Thus, Eastern options will have to operate on their own and that will necessitate greater numbers. In that respect, cheaper platforms - like the J-10 and Su-30SME - could be sought in numbers instead. In fact, the Su-30SME can be bought from Russia and then routed to China for customization before being sent to the PAF.
On the other hand, while the PAF would not be able to buy more than 2 Typhoon T3 squadrons, it can at least mesh the Typhoon with the F-16s. They can probably operate from the same bases and obviously communicate with one another and the Erieye via Link-16. Some munitions can also be shared, such as the AMRAAM, JDAM and Sniper ATP, while Turkey can serve as a source for SOW (e.g. SOM ALCM, Atmaca AShM, HGK, etc) and AAMs (e.g. Merlin MRAAM and Peregrine HOBS AAM).
There is also the Gripen E/F, probably the cheapest option available, though very close in parameters to the JF-17 Block-III. That said, $130 m for the fighter plus the support package is a good price, it (above the JF-17) gets you 10 hardpoints and supercruise. Is it worth it (over the JF-17 and F-16)? Probably not.