How old are you? Can you afford the $600+ STI car payment?
plus insurance? (assuming you're at least 25+, otherwise you can pretty much forget about it).
A STI really only wins over the base WRX on an actual race track. For daily driving - the WRX is tons of fun.
The Evo has their Raliart version which is similar to the WRX as well but a bit more expensive.