Hi, Maureen! Welcome to the dahlia forum!
Off the top of my head, I'd probably go with Bonaventure, Mingus Wesley, Homer T and Bella S. And I'd also throw in AC Paint for it's wackiness and different blooms.
As far as suppliers, I like Tall Grass, Connell's, Clack's and Delightful Dahlias. Buying packaged clumps is sometimes like rolling the dice as far as getting mislabels. But I've had good luck with American Meadows.