Enkei Japan makes some nice wheels calls the Tarmac-ESs that they don't sell in the US. They make 17x9 ET50 wheels in 5x100. Red Rocket (recently banned) was running 17x9s in the front and 17x8.5 in the rear with 255 tires. They are very lightweight, even in 17x9 they are like 17 lbs. You can order tham from here:
With air freight they come out to be about $350/wheel.
They make 17x9.5 +35 for the EVO in 5x114.3, I could see that being an option on an 05 STI.
Cobb used 18x10 Kodiak wheels on the conebasher car. Not cheap.