You probably don't want it totally turnkey - I mean, you can - LegalZoom is the most well-known, but Wilson will incorporate you and give you the whole kit and caboodle for just $5k. Plus, if they like you, they'll make intros to angels and VCs for you when you're ready.
That said, there are some reputable forms and sample documents; here are some:
Wilson's Term Sheet Generator: http://www.wsgr.com/WSGR/Display.aspx?SectionName=practice/t...
YC's Series AA documents (also by Wilson): http://ycombinator.com/seriesaa.html
Yokum's walkthrough of the Series AA docs (he's the Wilson partner responsible): http://www.startupcompanylawyer.com/2008/08/23/how-do-the-sa...
The incorporation docs for Founders Fund companies were once available on TheFunded.com, but I can't seem to find them in my thirty seconds of poking around.