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The two decisions that shape the build are how many panels you want in front of you and how tolerant you are of the machine going down. Everything else follows from those, and both are cheaper to get right at order time than to retrofit.
Treat the display chain as one system: card, cable, adapter and panel all have to agree on a mode before an image appears. Most support calls on multi-screen desks trace back to a passive adapter, an unbranded cable or a display limit on the card, not to a shortage of processing power.