Hi I'm looking at an HS10 used for around £750 with SmartIII & CC40r filter for around £100 more. I think the HS10 looks good already, any users out there think the SmartIII calibration wil make that much difference? Or best to spend the extra on a better (grey) screen? Smart III is american- I have Avia already - but is the Smart mainly for NTSC sources or will it also improve PAL performance (most of my DVDs are PAL). Or do I just go with the HS20 at £1498?