The highest resolution of the Acer P1173 is SVGA (800x600). That's 53% less resolution than the most frequently found native projector resolution of WXGA (1280x800). Across all projectors of a similar age and spec to the P1173 the resolution ranges from nHD (640x360) to DCI 4K (4096 x 2160).
Other data projectors that have a resolution of SVGA (800x600) currently available that you might want to consider include cheaper projectors such as the Optoma S316.
If you are looking for a projector with a higher resolution then you might want to consider the Acer H5380 ($381.99) (WXGA (1280x720)), or the DELL M900HD (WXGA (1280x800)) which also has a higher Rating.