As you'd expect, Digital Storm offers dozens of recommended configurations as starting points and you can swap components to get your ideal configuration. Most if not all systems appear to have access to the same 3D monitors: a 22-inch ViewSonic, the 23-inch Asus VG236H, and the 23.6-inch GD235HZ -- but only the latter two are available in a set of three.
All of the mentioned displays appear to be reasonably priced for a boutique dealer. Three VG236Hs ship with the necessary glasses for $1,304, which is in tune with e-tailers' pricing. Naturally, the entire package is still pricier than building it yourself, but extras like lifetime tech support and factory overclocked parts will always come at a premium.