The signup page is pretty up front about the pricing and capabilities. The link already takes them to a straightforward and clear summary of the different options, so I don't see any reason not to make the link text into something that is more likely to bring them to that page in the first place.
I do find it a little funny that among the few comments that have been posted so far, some people are suggesting I make the fact that the product costs money more obvious, while others are suggesting I instead entice people with the "sign up for free" aspect. :)
