Hey Nancy,
I like the split sole, canvas type. They allow you to feel the floor better, IMO. My new ones that I love are Bloch Pro Elastic:
Women‘s “Pro Elastic“ Ballet Slipper - Style #S0621L at Discount Dance Supply
They have elastic all around them, so you don't have to mess with the pesky strings, and they come with the foot straps already sewn in, which is nice. You have to order them about two sizes smaller than your street shoe, and I wish I had gotten the C width instead of the B... I had to stretch them out a bit, but now I love them! (PS discountdancesupply.com has the best dance stuff/prices. Shipping is expensive, though.)