SVGA vs XVGA for home cinema

Hi chaps, I'm still trying to get a good demo organised and not having much luck so here goes. I have a NEC vt540 xvga projector which i use fotr HTPC, digital TV and DVD. If I go for one of the newer SVGA home cinema projectors like the z1, z2, will I notice the loss of pixels at all? Will I see less resolution at the usual screen size i am used to ? Bu my workings, there should be less screendoor since bigger pixels for same screen size.

any thoughts?

thanks