I'm looking for pump advice again!

I'm trying to pick a pump through my insurance, and can get the PISA, Freestyle or Spectra all covered. I used the PISA to EP last time. Are the FS parts compatible with the PISA? I know I can hack the Spectra to fit my PISA parts. I haven't taken my PISA out of storage yet (on my list for this week, hopefully), so I'm not sure if I can even use the old one as a back up, or what the parts really look like.

I'll definitely need to use the pump at work and to build a supply before going back. Whether or not I EP (at least right away) will depend on if the baby takes to BFing.

What would you do? What did you use?