Lloyd, those are some awesome systems you heard & amongst the best in the world. Though personally if cost was no object and I wanted to go all-out on tri-amping the Arrakis, i'd run 3 Vitus MP-S201's connected to a Vitus MP-L201 linestage.
Yeah my plan is if I buy a piece of land in future, i'll get an architect-designed house built to my specs with a dedicated listening room custom-sized to the ideal dimensions for the G1.1's, even though they may come along later. I would still choose the G1.1's over the Arrakis (even if I could afford the latter) for sentimental reasons due to how the Infinity IRS-V's blew me away. Also with the G1.1's bass amps, you only need a high current stereo amp to drive the midrange panels which obviously saves big bucks.
From my experience, the IRS-V and later G1.1/1.2 line arrays are the only speakers capable of recreating a life-like image and concert level dynamics. They are also more room friendly than normal box speakers due to their figure 8 radiation pattern. I have to smile though as i'm far from slumming it with my Magico S5's!