The lack of response is because there are so many dahlia varieties that meet your needs. There are over 50,000 named varieties and 4-5000 that are still being sold. Some nurseries specialize in varieties for cut flowers. It very late in the season to be ordering as many of he varieties are sold out. Two of the largest vendors are Swan Island Dahlias and Dan's Dahlias. Both have web sites and they do tell you if a variety is a good cut flower.
Some recommendations:
White: Bride to Be
Pink: Chilson's Pride