Looks great! You should try an sti scoop on that bad boy.
Don't have a lot of options there-The scoops on the legacy, outback, and Baja are integrated into the metal of the hood, there would be a lot of sawzalling to get stuff to work, which isn't really worth it on the stock steel hood. Which is ludicrously heavy.
However--I agree--the car's big so a big scoop won't look too bad. Someone makes carbon Fiber hoods for the BE/BH (2000-2004) Legacies that would fit. They come with the sti-style scoop, and a vent between that an the front of the hood. They look a lot like byron's hood in design, but made of cf and for the legacy. That project is for 2009-2010.

First up is the wrx 4-pots I ordered from fred/capitaland. Then it's rear rotors and pads. Then Catback some time in early spring.