I know I'm going to be in the minority with this one, but... My friend has a PBP stock '11 STI base sedan with no mods (yeh I know, even stock exhaust), and I have a '12 PBP WRX Limited sedan with Stage 1, SPT exhaust and a STI rear sway bar... I've driven his car around town and it's nice but I personally don't feel the need to trade up. As a daily driver, I like the better ride and less shifting with my WRX, but honestly they're both very livable on a daily basis.
Yes I know, with supporting mods the STI is the better car, but then again I'm satisfied with my WRX. I get around the same gas mileage as my WRX when I drive his STI... He gets even better because he drives like a granny.