I'm in the same boat, I would love a 2.5gt but it's hard to find one around here that's been cared for properly. The H6 would be nice if it wasn't only a bore-o-matic.
But I remember seeing this build-up a few years back that would be awesome to do...
http://blog.perrinperformance.com/perrin-h6-build-up/
... a man can dream can't he lol