that subie is beautiful. seems a lot of people are doing gunmetal... doh! mine is honda "athletic gray" with various pearl added to the mix.. in the sun its absolutely stunning, but otherwise it just looks plain. looks very similar to the new Lexus RX330 gunmetal color (flint mica)
anyway, go with what best suits your personality. but if i had to choose a color for the early Z, i'd say go with a nice dark metallic color such as green, blue, maroon, gray, or any shade of silver as long as it has plenty of metallic in it.
good luck!