I vote Gold! They will look awesome with your blue '11 WRX.
I just purchased a set of Ultraleggara's for my '12 WRX, but I got the Crystal Silver one's. I really did not like the gray wheels that came with the car. (I got 17x8, 5x100 with +48 off-set and they fit good).
"mosc" is the wheel and tire man if you got any questions, he has a great informative post at the beginning of this section and recommendations if you PM him.
2012 WRX Sedan "Satin White"
2011 Outback 2.5i CVT "Steel Metallic Silver" w/19mm RSB