Gee, you don't want much...Koetsu sound for $250??
I've not heard the Koetsu Black, but for $250 the Denon 103R maybe your best bet. I read here (or at VA) that someone actually prefered it to the Black.....but who knows what the circumstances were?.
Anyway, I can vouch that the 103R is a superbly musical, coherent and dynamic performer. For sheer enjoyment and involvement in the music, the 103R rates off the scale. It does ok in more objective 'audiophile' terms too - at least when not directly compared to much more expensive cartridges. Superb tracker too. I've enjoyed mine imensely for the last 5-6 months.