I have a Screenplay 7200, higher resolution than the 5700 mentioned but otherwise the same.
I used to own a Sim HT300 but it was dim and noisy by comparison - I'm happier with the Infocus unit although it's more plasticky.
I tested DVi on the projector & compared it to analogue component from my 598 - there was little if any difference in quality, although the DVi player (a Momitsu 880) was rubbish. I'd love to try the HDMI output from a G98 though...
I think I paid about UK�3700 for the Infocus 7200. Currently I believe the BenQ 8700 is the cheapest (same spec) HD2 projector in the UK. I am certain however that the new low cost LCDs (Panasonic & Sanyo) are well worth a look too.
Regards
Paul