I had both PV1 as well as PV1D and also when I had the PV1D, I had the 608 for a smaller place.
My suggestion based on the experience, though PV1(D) is good, I would opt for a sub with mic based built-in EQ as it is not simple to tune the sub.
In a smaller room, the 608 performed very well which makes me believe that the higher priced subs are not such a great value for money. Also, with PV1(D) there are practical challenges given its shape, it is not flexible with positioning (it fires both ways) as well as one needs to be careful with vacuuming etc as there is no protection for the woofers.
Currently I gave up on the idea of a seperate subwoofer and go with the speakers which have enough frequency response to satisfy my needs or go active route (like Beolab 9) where the bass frequency reporduction is not much of a challenge.