Here's one I stumbled across:
http://members.bellatlantic.ne....html
Not a real "professional" site but it's kind of typical as far as a lot of vintage Subie sites go. Check this one out also:
http://www.scoobymods.com
I'm not sure how parts for the HC27 would be (I think that's the engine code for the XT6). I know that EA82 and EA82T parts are relatively common, so if you get a turbo-four XT you will have no problems there. The electric suspension is definitely a consideration as far as repair work goes (isn't every elec. suspension a PITA eventually?)
Rust really hasn't been a problem on the Subies I have owned, they actually seem to be more rust-resistant than other Japanese cars of the same era. I think the rusty examples stem more from 1) off-road abuse and 2) neglect. Subarus love snow, and they tend to attract a lot of dirt and salt as a result. But as long as they're clean, they stay pretty cancer-free.