Iain,
Not sure how, but your post "passed me by" without response.
Already have the first two in my two 737 ref manuals (both by Mr. Bulfer, funnily enough) and the checklist does look very light. As I'm not flying the PMDG 738, prefering the fleet 738 with the Magenta MCP panel, I find myself using
Werner Schott's Default B734 checklist. Again, it's not 100% complete for my liking, but again, I've modified the flow a little to suit.
For the PMDG pilots, I (again) would recommend
this FS2Crew 737 checklist. It's complete enough to get a "real" 737 in the air and back on the ground.