The Evo 7's and 8's arent visually as nice as the 6 (as above) but in terms of actually driving etc they are oodles ahead. A friend of mine chopped his 6 in for a 7 a month ago and wouldn't look back! (even though im tempted to buy a 6 once i sell the S2000!)
As for performance, if you upgrade the ECU (GEMs or something) exhaust/decat, filter etc etc you will easily see a RELIABLE 350hp!!!!! I used to give me Evo7 a hard time pretty much every time i used it and not once did it brake on me!!!!
Chris