The Kumho 716 has an excellent track record. It's an all season tire with a 380 treadwear, and has excellent feedback from the customers at tirerack.
Below are the sizes and pricing. Oh, they don't list the 215/55/16, but do list the 225/55/16. The difference in size is not even significant, (0.3" taller) and the price is only $63. The Dunlops are $91 each. I can buy them installed and balanced from the local tire store for $84 each... which is about what shipping and installation would cost going through tirerack... without the hassle!
They are going through a name change on the tires. They are removing the 'ectsa' part of the name, and just calling them the Kumho HP4 716. Tirerack still has both listings, so if one show out of stock, refer to the other.
Here are all of the sizes and prices...
Here are the condensed customer survey results...
Below is Tirerack's personal survey (feedback) from their customers on this tire.
The Dunlop A2's are also excellent tires.