The PJ WX6170N has a maximum resolution of WXGA (1280x800). That's 30% more resolution than a XGA (1024x768) multimedia projector, which is the most frequently found resolution. Across all multimedia projectors of a comparable spec and age to the PJ WX6170N the worst resolution is XGA (1024x768) and the best is WUXGA (1920x1200).
Other multimedia projectors that have a resolution of WXGA (1280x800) currently available which you might also want to consider include the Epson PowerLite 1761W ($649.99) which has a better Rating.
If the resolution of this data projector is too low for you then you might also want to look at the WUX400ST ($4,946.58) (WUXGA (1920x1200 and higher rated) and higher rated), or the WUX-450 (WUXGA (1920x1200 and higher rated) and higher rated) both from Canon.