i believe the s2000 is the better choice due to the reasons' previously mentioned, but there's no need to bash the rx8, saying it was released prematurely yadda yadda yadda.
like someone mentioned earlier, it's like getting 240hp out of a B16.. WITHOUT turbo, the renesis motor is an astounding achievement

however, i read somewhere that the bay is too crammed to fit a turbo setup? back to the drawing board..

the s2k also has the aftermarket advantage right now as well.. turbo, s/c if that's your thing.. unlimited suspension combinations, and all the rest of the goodies available to all hondas