Maybe Pakistan can take a look at Chinese asymmetric doctrine for defence. The lack of funding to build a tit-for-tat airforce may be compensated by having more SAMs and long distance firing power. The long distance rockets, Babur missiles and SRBMs can be used to cripple the enemy's airports. Effective strikes at the airports may significantly reduce threats from air. Strong SAM system can take care of the rest.
It's "said" that Chinese 200km WS-2 rockets are tested in some Arab country:
http://images.huanqiu.com/bbs/2010/06/09/S0D20100609095010MT419331.jpg
http://images.huanqiu.com/bbs/2010/06/09/S0D20100609095012MT509157.jpg
http://images.huanqiu.com/bbs/2010/06/09/S0D20100609095011MT693658.jpg
It's "said" that Chinese 200km WS-2 rockets are tested in some Arab country:
http://images.huanqiu.com/bbs/2010/06/09/S0D20100609095010MT419331.jpg
http://images.huanqiu.com/bbs/2010/06/09/S0D20100609095012MT509157.jpg
http://images.huanqiu.com/bbs/2010/06/09/S0D20100609095011MT693658.jpg