The highest resolution of the PT-VX605N is XGA (1024x768). That's 23% less resolution than a WXGA (1280x800) multimedia projector, which is the most common resolution.
This projector's resolution (XGA (1024x768)) is in fact the worst resolution amongst all 10000:1 contrast ratio data projectors that were launched in the last year.
The best resolution across similar types of projector is WUXGA (1920x1200).
It may also be worth also looking at one of the other data projectors that have a resolution of XGA (1024x768) currently available including cheaper data projectors such as the Benq MX882UST (£1,089.19).
Projectors with a higher resolution that might also be worth considering include the [plb_3710343] (WXGA (1280x800 and cheaper) and cheaper), or the Hitachi CP-WX5500 (£1,165.66) (WXGA (1280x800 and cheaper) and cheaper) or the Epson PowerLite 585W (WXGA (1280x800 and higher rated) and higher rated).