Rob Munach said:
Your current WRX is probably way more capable of a car than you are as a
driver. Why not just keep it. If all you want is hospower, you can find
some cheap american iron!
That's probably a bit unfair. Really, you don't know how good of a driver
he is. But, with reference to the question, I would say, it depends on what
you want. Having driven the WRX and owning the STi for about six months, I
can tell you they are very different cars. Only the appearance is similar.
The STi is way more powerful; because of its close-ratio six speed, it is
not an easy car to drive at first. It will take off like it is kicked at
about 2700 RPM. It has very sharp steering and different handling
characteristics depending on whether you are on the gas or on the brake. It
will understeer and drift if you are off the gas, and oversteer as soon as
you hit power above 3000 RPM. It also has very tight steering; you had
better be paying attention. The WRX is more forgiving and more sedate, but
not lacking in power. It is more practical as a daily driver, has higher
clearance so it can go more places, and its AWD system is better in bad
weather unless you know what you are doing with the DCCD in the STi. Also,
the Subaru recommends synthetic oil for the STi (MOTUL here in Canada), and
here in Canada, it costs about $110.00/oil change every 6000 KM (3600
miles). There is no such thing as a cheap part for the STi. The tires are
expensive (16" rims will NOT fit the car), and the brake parts are a
horrendous price. It is also a pig on gas compared to the WRX, and it is
very hard to lay off the hotpedal, so gas mileage is even worse.
So, if you know what you are doing with a very high performance car, you are
wanting to scare the bejesus out of your passengers, and you have lots of
twisties to take advantage of it, the STi is worth it. If not, I'd stick
with the WRX. It'll do the job and it is way cheaper to operate and own.