I don't know of many, if any, 5 speed failures in the newer cars. Don't let that make your decision.
What are you using the car for?
Add up the price of the "a few bolt ons and maybe a nice set of coilovers" to the WRX and then what is the price difference between the two cars?
Is the price difference enough for you to justify a 6-speed, limited slip diffs, dccd, multi-mode traction/stability control systems, much better brakes and different seats?