The PAM326 and PAM327 aren't the "hot" Panerai's so they don't have any "collectibility" factor IMO. If you like the blue dial and titanium combo, then the PAM326 / 327 is match made in heaven for you.
I suggest trying on the watch at your AD to see how comfortability is on your wrist. If you're not used to wearing a 44mm Panerai, then I highly suggest trying it on your wrist at your AD. My wrist is 6.75" and I find a 44mm Luminor the perfect size.
Movement-wise, the movement inside is extremely durable and should last you a long time. Not an in-house movement but a very robust movement.
Cheers,
Anthony