I would go with Ultegra or even Dura Ace. Shimano's pedals work great, are easily adjustable, and don't creak. My current Dura Ace pedals have around 12,000 miles on them, with zero maintenance, and they work as well today as the day I bought them.

Three years ago, I abandoned my Shimanos for a short time to try some Look pedals. I had heard about the famed "Keo creak," but dismissed it. After about 1,500 miles, I too fell victim to the Keo creak. I won't betray my Dura Ace pedals again.