Here's another one to consider:
http://www.thinkoutside.com/products...rared-ppc.html
It's a little newer than the other two you mentioned, but it has been getting great reviews from some PPC sites over the last couple of months.
I just got one for my X3i and am pretty pleased with it. No keyboard lag on it at all. Full sized keyboard. Only real drawback I found: no seperate number keys. I think they did this to keep the keyboard size down, while maintaining the full-sized keys.
Just more food for thought.
-- ADG