Sorry to hear about your problems, RSX-Sucks. Hey, we had another guy with that handle on these boards at one time.
WRX reliabiity ? Lemme see, 63k miles. I drive it hard too.
One loose steering fluid fitting. Tightened it. Cold clutch shudder has gradually gotten worse over over time, but always goes away once everything's well warmed up. Burns a quart of oil every 2500-3000 miles. Thin paint chips easily, replaced a broken windshield. Some kind of rattle in the dash which I can't find, but it's not too bad. That's it.
The transmission itself seems fine to me, though the gearing could've been improved upon.