I am comtemplating whether to invest in a Blu-ray Rom for my HTPC -probably the LG model as it writes to DVD as well.

But can those using HD (either BD or HDDVD) on non-1080p TVs or monitors comment: is the difference that noticeable? I have a recently purchased Samsung 32" R8 LCDTV & an SVGA Infocus X1 projector (which I use Zoomplayer to upscale the image to 720p/1080i depending). I probably will eventually get a 1080p projector, but not for some time.
 
Admittedly, watching genuine 720p trailers on the X1 is en excellent step up in resolution. But what about going down from 1080p to 1080i? Is it worht the cost of the drive? Thanks.