The highest resolution of the Vivitek D519 is XGA (1024x768). That's 62% less resolution than a 1080p (1920x1080) multimedia projector, which is the most frequently found resolution.
This data projector's resolution (XGA (1024x768)) is actually the worst resolution across all multimedia projectors that have been around for a similar time to the D519.
The best resolution across similar types of data projector is 1080p (1920x1080).
It is worth also looking at other projectors that have a resolution of XGA (1024x768) including a higher rated projector such as the ZX212ST (£1,226.59), or the ZX210ST both from Optoma or the Toshiba NHX21A.
Data projectors with a higher resolution that might be worth also looking at include the Optoma ZW212ST (£1,320.32) (WXGA (1280x800 and higher rated) and higher rated), the LG SA560 (£2,513.21) (WXGA (1280x800 and higher rated) and higher rated), or the Viewsonic PJD6544W (£652.75) (WXGA (1280x800 and higher rated) and higher rated).