Well, shoes are pretty personal. There are a handful of brands that make great shoes, and within those, if a given model is Speedplay compatible, it all boils down to which one feels the best on your foot.
Sidi, Diadora, Pearl Izumi, Shimano, Nike, and Carnac all make excellent shoes for recreational and pro use alike. I've got a pair of Pearl Izumi Vapers that work pretty well on my feet, and seem a good match for my Speedplays.
Good luck deciding.