The trench1 Euro fighters are going to be retired and shall be available cheaply the may however require upgrades i.e A to G capability and Radars. If PAF requires them then same can be done within a year however upgradation may take time.
On the other hand yeas Su35s if chosen may require at least two years for start of supply.
Though Russian tech has greatly improved yet considering IAF experience with handling SU30s and their continuous overhaul requirements one may easily judge that though SU35 is an improved form of SU27 yet it may have more requirements for overhaul/other issues as compared to Eu fighter. PAF should chose Euro fighter tench 1 as soon as possible and get them upgraded instead of investing more on F16s or going for Mirage 2000-5/9s from Arab countries.
This thread though may prove to be ambitious yet highlights the main issue of PAF in current scenario as well as near future. I have wrote many times that current PAF fleet even in defensive posture has limited number of tier -1 fighter as compared to IAF.
In current scenario if IAF INVOLVES 100 Su30s out of 240+ Su 30s along with 30-40 Mig 29s along with 30 odd Mirrage 2000s then number goes up to 170 which may easily go up to 200 upgraded Jets with long range BVRs and HOBs WVR missiles.
On the other hand PAF has total 76 F16s of which few are with CCS and about 56 jf17s. If we assume that PAF is able to bring 60 F16s and 50 JF17s ( some may not be ready due to overhauls/repairs) then number at max shall be 100 to 110 roughly half of IAF. Further PAF jets only have two BVRS with SD 10 having range of about 100KM and AMRAM120 with range of 110-20 at Max. The BVRs include Pirana1, PL-5, old versions of AIM9 with no HOBS so far available.
Further SU30 can engage many A to A and A to G targets at one time along with Mirage 2000.
So crux of above discussion is that this thread not required to be closed further PAF requires at least 30 to 40 capable jets along with HOBS WVRs and BVR of new era to counter even the existing IAF threat. Even in defensive posture PAF may need to go for offense and bombing of enemy strategic sites which can't be done by our current Mirage-III/Vs considering strong SAM/Radar network of India.