Nevow instead of twisted.web

I am trying to get an understanding of Nevow for a web app built 
on---appropriately enough---an asynchronous back end.   Our current 
prototype is built on twisted.web but we want a more restful api and 
easier framework to work with. 

Should I be working from trunk or 0.9.18?  The docs and examples all 
refer to livepage, for example, but the wiki says it is deprecated and 
to use athena.   So if I stick with 0.9.18 can I just s/livepage/athena?

Also, I wonder if I am even on the right track in exploring the livepage 
stuff.  Is that, indeed, the mechanism that nevow uses to replace 
NOT_DONE_YET as in twisted.web, or are there alternatives that I have 
not noticed yet?

Thanks much for any guidance.

Peace,
David S.