Try Canilla rice, usually in the Goya section of the super market.
I use it for sushi, and to make my Grandmas rice balls.
Polish the heck out of it, and the wooden "bowl" really helps.
Dip your cutting knife is a solution of water and lemon after each slice of the role.
The hard part is making a perfect layer of rice across the nori.
On the back of the nori package are usually good directions for making the rice.