the drivetrain of the EVO sucks... if anything look at an STI (the transmisions are beefy as all hell, plus you get an extra 500cc to work with)

as for turboing a type-r you can. it all depends ont he engine and how it was treated. i suggest getting a compression test done before you buy the car to see whats up, and if the results are good theres nothing stopping you from slapping a turbo on there.