The Legacy GT Spec.B is the one with the 6-speed. It doesn't have DCCD, but it's still nearly as bulletproof.
I went with the STI for a few reasons.
1. I think it looks better than the Evo 8 or 9. (The 10 is dead sexy though) If I'm going to own a car for a long time, I better not cringe when I look at it.
2. The extra .5L in the engine makes it much nicer to drive around town. The added grunt is nice in the mid range too. Since I'm not planning to do much power modding, the added torque to start with is a big plus.
3. Subaru has a much greater track record when it comes to reliability and safety. Not only can I depend on it lasting for a LONG time to come, but I can trust it not to kill me in the event of a side impact (God forbid.)
I admit that the seats suck though. You'll want to replace them with the Evo seats or aftermarket ones.
An increased bonus is the community. The STI has a much more mature community than the Evo for some reason. I'm not sure why since both (at the time) were out of the price range of the general run-of-the-mill douchebag. But IWSTI.com is a much more mature and productive community than EvolutionM.net *shrug* Plus, the local Suby community is really cool too.
After owning Subarus for a while and working on them, I've come to appreciate their honest simplicity (which has fled some in recent models unfortunately.) The design philosophy is sound, using a longitudinal engine and a symmetrical driveline. Ultimately, it's more normal and easier to work on and learn than most other AWD drivetrains. Engine > Trans > Driveshaft > Diff > Axles. There's just two more axles in the front.
Granted, I'd love to drive an Evo X "in anger." I'm sure it's a brilliant car. But there's just something more visceral and primal to the STI. Sword vs Axe. Both do the same job, one's just a bit more straightforward about the job.