Colts I suppose you mean:

1) Street Sense
2) Scat Daddy
3) Nobiz Like Shobiz
4) Tiz Wonderful

...have been the most impressive to me to this point....tough to say, as I still think many of the better horses of this generation probably have yet to run....certainly, Minefield and Napa Cat and some other allowance types to this point have a lot of talent....I still think some forgotten horses who are hurt like Run Alex Run are very talented too...Great Hunter is the only colt on the West coast that I think is genuine so far...