Ahhh, yes watershoes. I have pair made by Salomon that I bought on clearance at EMS several years ago on a whim (hey for $20 why not?) and although I've not used them for stream crossings they would work just fine for that activity. The model I have are a lot more like sneakers and made of a stiff mesh, unlike the surfer-style stretchy water mocassins. Sierra Trading Post has them for $39.95 as we speak:
Click HERE. Great all-around summer shoe for me as they breathe like nothing else.
Edit: My bad, I just noticed those are the women's model, but I left the link there for illustrative purposes. Sierra doesn't currently list the men's model. A google search shoes REI has the Techamphibian 2 for $90. You can probably find something similar for much less.