I don't know the quality of the David Cam. Posting some screenshots would be very interesting.
Unfortunately, it's not always possible to know on the forum what scan was made with what equipment.
I have tested three projectors because I was having surface artifacts with the Acer K135 (waves).
The combination Acer K132 (or 135) with the David cam is probably a very good match. My results with a Canon 60D were not completely satisfactory.
See this thread regarding waves in the scan and various scans I made using a Canon 60D with MagicLantern:http://forum.david-3d.com/viewtopic.php?f=6&t=6457
For great scan with a modified webcam, see Christians Mendes:http://forum.david-3d.com/viewtopic.php?f=7&t=5941
For very high quality, look at Narmella's letscan thread using his software and imagegrabber:http://forum.david-3d.com/viewtopic.php?f=8&t=6294
and this one:http://forum.david-3d.com/viewtopic.php?f=15&t=6546
I have also tested an alternate route: A HDMI capture card with a DSLR with fullhd progressive signal (Nikon D5200). The Nikon appears as a webcam:http://forum.david-3d.com/viewtopic.php?f=16&t=6534#p32897
I am hoping to test this setup with a 4k camera.
By searching the forum, you will find also many other great scans.
If you are going to use a Canon, these are the live resolution of most models.
Canon Rebel XS/Canon EOS 1000D 768x512 pixels
Canon Rebel T3/Canon EOS 1100D 1056x704 pixels
Canon Rebel T5/Canon EOS 1200D 960x640 pixels
Canon Rebel XSi/Canon EOS 450D 848x560 pixels
Canon Rebel T1i/Canon EOS 500D 928x616 pixels
Canon Rebel T2i/Canon EOS 550D 1056x704 pixels
Canon Rebel T3i/Canon EOS 600D 1056x704 pixels
Canon Rebel T4i/Canon EOS 650D 960x640 pixels
Canon Rebel T6s/Canon EOS 760D 960x640 pixels
Canon Rebel T6i/Canon EOS 750D 960x640 pixels
Canon Rebel T5i/Canon EOS 700D 960x640 pixels
Canon Rebel SL1/Canon EOS 100D 960x640 pixels
Canon EOS 40D 1024x680 pixels
Canon EOS 50D 1024x680 pixels
Canon EOS 60D 1056x704 pixels
Canon EOS 70D 960x640 pixels
Canon EOS 5D Mark II 1024x680 pixels
Canon EOS 5D Mark III 960x640 pixels
Canon EOS 5DS 960x640 pixels
Canon EOS 5DS R 960x640 pixels
Canon EOS 6D 960x640 pixels
Canon EOS 7D 1056x704 pixels
Canon EOS 7D Mark II 960x640 pixels
Canon EOS-1D Mark III 1024x680 pixels
Canon EOS-1D Mark IV 1056x704 pixels
Canon EOS-1Ds Mark III 1024x680 pixels
Canon EOS-1D X 960x640 pixels
Canon EOS-1D C 960x640 pixels
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern