Yeah, I'll second Hitekvoop's sentiment that the LK-PD2 is a robust starter projector and a great candidate for upgrading. I detailed much of my first upgrade of my PD2 here: http://www.photonlexicon.com/forums/...ghlight=lk-pd2
If someone wanted to do a full upgrade on a PD2 in today's world, I would consider using the X-Laser amp paired with a set of Scannermax 506's. They X-Laser amp is tiny and runs on 12V. I would replace the PD2's PSU with a good, but small 12V psu and run everything off of it. You'd need to expand the size of the open hole used for graphics A-LOT to accommodate for 506's wide scan angle potential.
If desired, the green could easily be upgraded with a 120mW 520nm green with a G-2 lens or a 400-700nm single element glass lens from Aixiz. Replacing the drivers with analog drivers from Lasershowparts, FlexMods or the new 3 in one driver. (The blues and reds diodes are probably fine as-is for most folks once driven by a good analog driver).
Before any upgrades, you'd have a good lumia box with basic graphics/beam capability. After all the upgrades, you'd have an analog, high performing, graphics/lumia box.
Good luck with the sale.
-David
"Help, help, I'm being repressed!"