Dan,
A mate of mine recently bought a black Evo 6.5 Tommi Mac. Its completely stock.
Very nice car but personally id go the GTR.
The Evo 6.5 interior didnt impress me. The seats are nice but the dash and console is pathetic. Straight out of a Lancer GLi.
Stock vs stock the GTR would kill the Evo. Stock evo really did not impress me at all power wise, was getting killed by fairly stockish silvia's. However im sure this would all change as soon as it starts getting modded. Still love the car, it handles great (better than the GTR im sure) and looks nice, but personally id go the GTR.
My 2 cents.