it seems you want a comfortable car. it may be worth waiting for the new wrx to come out. it seems the new one will be more comfortable then the current model.
there is tons of road noise in the sti as well as the wrx. if you're willing to spend money on redoing your entire interior. have you thought of the audi a4, its much more comfortable. and with just a "chip" the 2.0T is putting down some serious numbers. and its a bigger car so you will fit in it.
the worst thing you can do is buy a car you can't be comfortable in, you'll regret it.