Pricing it out based on Garmin's site, 2xG5s (including HSI w/gps interface), gad29 and gmu11 runs $6865. Two GI275s, no gad29 needed, gmu11 runs $8770. 27% price increase is easily worth it IMHO.
Also, I never liked the square shape of the g5. It makes a panel look mis-matched. That's just a...