Maybe the GTi and VXR are compared cos they are both 2.0T aren't they?
Whereas the XR5 is a 2.5T, so comparing it to a lower spec 2.0T (in the range) would be unfair? that's how i'd justify it anyway
However i'd agree that the GTi vs SRi-T is prob fairer due to almost identical quoted figures...i have no idea on prices