I have an RX-8. I test drove everything from the M3, S2000, 350z, STi, EVO, blah blah blah...
Are you a mazda fan? I am. The look and feel of the RX-8 Won me over. THe EVO and STi have basically the same look in my opinion. Both are based off of the lower model sedan in each manufacturers line. The S2000 is a breed apart. I just can't do 2 seats anymore. Same goes for the 350z. 350z is a parts car though. Same engine across the nissan line. Great car (fast as heck, just dull from the tech perspective. M3 - well - hello - awesome, but about 20K that the rest of the cars listed here.
The RX-8 offered the interior refinement, the zoom zoom factor (mazda buff), the handling that none of the others can match (read the top gear article). Ever heard drive for show putt for dough? Fast in a straight line is great, but if you can't turn - well.....
That is my 2, no, more like 6 cents.
Skuz
p.s. Also have a P5. Another great car. Handles better than the WRX (I have tested this - my brother has the WRX)