Yonex RDX 500 MP = My holy grail
Such a wonderful racquet. I would pay big money for a brand spanking new one. I have no idea why they were discontinued, they hit it on the spot with that. I also like the fact that it's made in Japan, it just feels like such a solidly made racquet, not to mention the great buttery feeling when you hit the ball.
It's my main racquet that I play with but unfortunately I now have to scour the internet searching for used ones in good condition.