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I wouldn't trust the one main belt to some aftermarket brand probably made in mexico. I have only used OEM timing belts on all of my projects. Alt and power steering I sometimes use aftermarket if I need it right away but even for those belts the cost is usually about the same and you don't have to make several trips to the store because the knucklehead continues to give you a part that says it will fit but does not. Spend the extra $10 or however much it is and sleep better at night
I've also heard good about Gates. The racing version might make a little noise like the STi belt over a wrx belt, I like the noise personally.
I know it's a different app but my brother had a kragen T-belt break on his honda with about 15k mi and a little less than a year old. I checked the tension on it personally and it wasn't too tight or too loose......just a little food for thought.