After trying various recipes, I found out that this one works for me. I keep a bottle of the vinegar mixture in the refrigerator. It works with white wine vinegar and I had good results with short grain rice as well. Ron Suzuki,at the Cookshop in Vancouver, was the one who got me hooked on making sushi.

Ingredients:
Seasoned vinegar
1 cup rice wine vinegar
1/2 cup superfine sugar
1/4 cup  salt
Rice
3 cups japanese rice
3 cups cold water
6 tablespoons of seasoned vinegar

For the seasoned vinegar: Combine ingredients in a small sauce pan over med-low heat until sugar and salt are dissolved..Allow to cool and store in the refrigerator.
For the rice: Put 3 cups of rice in a large bowl and rinse until the water is clear. Drain the rice and add the 3 cups of cold water to a pot with a good-fitting lid.. DO not cover the pot yet, though.
Over high heat, bring to a simmer. Once the rice is simmering, cover rice and reduce the heat to medium low.
 Cook for 10 minutes without removing the pot lid at all.Turn heat down to the lowest setting and cook for another 10 minutes.
Now, turn off the heat and let the rice sit in the pot ON the stove for 15 minutes.
Turn the rice into a wooden, glass, or stainless steel bowl and sprinkle with 6 tbsp of seasoned vinegar.
Mix the vinegar with the rice with a cutting motion being careful to only mix for about 5 minutes Max.
Cover rice with a damp towel and allow to cool to room temperature.
This rice is easiest to manipulate while it is room temperature or warmer.
 If you refrigerate the rice it gets harder to work, but you could save it for leftovers--just keep it covered with a damp cloth.
This makes enough for about 10 rolls of Maki-sushi or 60 pieces of Nigiri-sushi.