Hadn't seen the Phil harmonics til' you this. Definately nice speakers, the only downside is they don't make center or surround speakers that I could find.
Do you truly even need a center if it isn't a positive in the GRAND scheme of things? PH do make surrounds, by the way. There's also a center that's been prototyped but isn't in production just yet.
You think even with 2 12's, they need to be ported?
For music, there won't be much demand on the subwoofer below 30hz, so for music sealed will be fine.
If you want to be true to the LFE channel in movies though, you won't even be coming closer.
Let's say you watch a movie at about -8db on the receiver (pretty average speech level in general, but capable of massive peaks)
Your speakers need to be capable of around 97db AT the listening position, and your subwoofer needs to be capable of
at least around 107db at the listening position. Honestly, that's minimum. If you really want a high end HT (which I assumed you did from your budget) then I think your system should be able to cruise along at reference levels (average speech levels near 85db, peaks as high as 105db, subwoofer peaks as high as 115db).
Movies have strong content down even below 15hz. The F12 can't even complete a 100db sweep below 25hz:
Its vented sibling the FV12 uses a cheaper, less capable driver so it has its limitations too (it'll get deeper, though).
Its 15" siblings IE the F15 get closer. For a great HT I'm sure they're a very good choice, but I wouldn't expect them to cruise along at reference levels. They're still limited below 20hz by the sealed alignment.
The FV15 is where i'd be starting, if I were you. That'll get the extension and output to cruise along no matter what movies throw at it. The FV15HP has a more powerful amplifier for a slightly extra cost... I think it's worth it.
As far as main speakers go, I'd also be looking at speakers that can handle dynamic range and still be very musical. That was why I recommended those JBL Studio Monitors. If you take the center out of the equation, that's about $3200 on mains.
I don't really consider the Philharmonics to be dedicated HT speakers either, but they're likely to be a good step up from the Aperions. I would still be looking at something more dynamic personally. 2channel and HT DO have different demands.