Linksys PAP2 would be nice as I am using one but there is no PSTN passthrough.
Sipura 3000 is quite flexible and it does have PSTN passthrough. Overall, it has gotten good reviews.
If you or your friends/relatives that you are going to call are in a low bandwidth or bandwidth restricted environment, then you can perhaps consider Grandstream BudgeTone 200 phone which also supports iLBC codec in addition to the usual codecs. BudgeTone HandyTone ATA HT-488 also has PSTN passthrough support. Linksys and Sipura also do have low bandwidth codec support for G.723 and G.729 but they don't have iLBC.
I have only used Linksys PAP2, so I don't have any personal experience with Sipura or Grandstream products.
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