Don't forget, those UK prices include 17.5% VAT, road tax, tags, etc. The actual base price is only $25984 US. Base price of the UK300 (with performance pack) is $32349 US. I would expect the price of the STi in the UK to be similar. In other markets, the STi commands about 20-30% more than the regular model, which would make a $33k price tag about right for the UK. Barring any price increases for the standard WRX, I would predict the US base price for the STi to be $29995. I expect 2 color choices at most for the initial offering, one of them being rally blue, possibly the new bright yellow as the second. I wouldn't be surprised if they were all blue and shared all the same equipment.
-J