Pakistan's SAM program is as follows:
The Pakistan Air Force:
Has ordered the MBDA Spada-2000 "Plus" which entails upgraded electronics, sensors and enhanced command & control capabilities. It has a range of at least 20km, and the PAF may acquire more batteries of the system. This will act as a low to medium-range SAM system.
http://www.ideaspakistan.gov.pk/ideas2008/downloads/IDEAS2008_EventBulletin_2.pdf
PAF is actively looking for a long-range SAM system, the front-runner is the Chinese FT-2000 or export HQ-9.
PakDef Forums - View Single Post - PakDef in Media
Pakistan Army:
The Pakistan Army recently ordered the revival of RBS-70 short-range SAM, these will be augmented by the Anza Mk.3 in the V-/SHORAD role.
The PA has also chosen the RBS-23 BAMSE for the medium-range requirement:
PakDef Forums - View Single Post - Pakistani Land & Sea Based Air Defence
Four countries including Pakistan interested in RBS 23 BAMSE - Military Photos
Worth noting that Turkey is also interested in BAMSE, and may acquire it with rights to locally manufacture and re-export. Given the recent upsurge in Turk-Pak cooperation, I think BAMSE will eventually be finalized.
Pakistan Navy:
According to Usman Shabbir on PakDef, it may acquire an 'air defence system' from South Africa - which I suspect is the Umkhonto-IR. Given Pakistan's recent purchase of MAR-1 ARMs from Brazil - with ToT (Usman Shabbir on PakDef) - we may see trilateral cooperation with Brazil & S.Africa. I think Darter and Umkhonto-series will be the main areas, and possibly Embraer C-390 transport too.
If this happens to be the case, then I believe the Umkhonto-IR and R will be the mainstay VLS-SAMs in PN's future fleet. The Umkhonto-IR will likely be used on MILGEM and a larger MRTP-series; while a 25-30km variant of Umkhonto (R/NG) would be used on the future mainstay frigates...of which PN requires 8 ships (as per H Khan on PakDef).
Not sure if PN is planning on a long-range SAM system, but if it does, then I think it might try to procure the MBDA PAAMS involving Aster-30 & 15 for use on air defence ships. H Khan also said PN is hoping to acquire 6 FFG of a new design developed with assistance from Turkey and Germany. It is possible that 4 of these new ships could be equipped with a complete set like PAAMs...while 2 can be committed land-attack with VLS-LACM, cannons, ability to deply special forces, etc.