right now i have v7 spec-c w/ vf22. it's fun to drive. i just short shift around 6~7k even when i am spirit driving. i honestly don't really remember what ej205 felt like. lol
If I were to do everything again. It would be built 2.5l + v7 spec-c or v8 head w/ gt35r.. But I have never drove or owned built 2.5 so it's probably just me wanting to try different stuff.
ej207 are amazing. car feels more like EVO(likes boost, slingshot feeling) then 2.5(judging from stock sti i drove. not much, i know).
finding a person who have driven or owned both ej207, ej257 will help you the most. some tuners feedback would be most helpful IMO