Kannibul, you're absolutely right. I simply love the suspension setup in the 370z. I think it's just right. It's not too harsh or soft. I have to say, Nissan did an amazing job on it. It's a vast improvement over 350Z. I don't think I can settle for anything more harsher (i.e. Nismo Z). Even some of my friends (who drives BMW) were impressed how perfectly balanced the suspension was (firmness wise).
Well enjoy driving the Z because I know I am!