You can work with the cheapest affordable display now (I wouldnt IMHO) and upgrade to whatever is affordable later (4K and up)
The nMP has a lot more offer if you grow.
Just the ability to add more displays and peripherals.
We use a two Sonnet Echo Express III-R (rackmount version) thats home to:
REDROCKET
BMD UltraStudio 4K (via Thunderbolt 2)
BMD Extreme DeckLink
Pro Tools HDX
ATTO SAS R680
Just cant beat the future options with the nMP.
And since you posted a kick ass config, I see you mean business 🙂
The above runs FCPX, Avid, Pro Tools, Resolve, Adobe CC 2014 and then some.