mikerussellnz: I bought a refurb previous model 15 inch MBPR just after the hardware revision bump and saved about $800. It's a great machine and I can recommend the refurb products, apart from the plain packaging everything looked like new.
I have a LG panel, no issues with image retention. You might want to check the dates of the posts about retention issues, there were issues with the first generation LG panels, but that may have been fixed in the SJA2 panels that started shipping last Jan. My panel is a SJA2.
Is the SJA2 on the command line check or is that labelled externally on the machine?
There was a thread on my Yahoo iPad forum about refurbs, a key issue is the extensive testing they get, that the new ones don't get, which is a good thing