Narining ko na yung DLS reference and I personally used to own the PS 165v. Over the two, I would recommend (with a bit of bias) the Focal. For me, mas type ko yung kapal ng mid-bass ng Focal compared to the reference but make sure to have it tuned properly. The 165v is very lively and if not tuned properly, the highs could be fatiguing in long listening sessions.
Decent choice of amps you got there, up to you really which one you would prefer.
For the subs, since you plan to have these on a pick up - the MM840 with its shallow mounting depth puts it in an advantage. for deadening, both STPs work the same and I doubt any noticeable difference in SQ.
You might also want to consult a competent installer and get his opinion... Goodluck!
