Oh yeah, forgot about them! I know there's some old NEC MultiSyncs that worked on 15kHz, and there were some others, like ones you could get over here with Acorns - I think they were rebadged Microvitecs or something. Though, yeah - Acorn - US - I don't think so... But without an arcade cabinet where are you supposed to put it? Yeah, plain 13-21" non-flat CRTs probably haven't changed all that much in the last couple of decades or so, and Philips make decent tubes (my two Panasonic TVs have Philips tubes... go figure ; however their VGA monitors are utter shit) but CRTs do age unfortunately. Colours tend to go crap down the sides (especially on older sets without built-in degaussers), convergance goes arse-ways after a while, and worst of all - some of them go out of focus after a good few years (though that's probably easily fixable). I have a 11 year old Hitachi 14" TV (with RGB SCART inputs of course), and after lots of use the picture's still pretty damn good, but still it's probably not as good as it used to be.
I have a 1084s and Redmond Cable (www.redmondcable.com) told me that you can't make a working RGB cable to use on the 1084s and PlaysStation. A friend of mine tried to make a cable for me but could never get a picture. He did make a cable for a dfferent monitor but that monitor is smaller and I don't know if it's true RGB because when I put a PAL game in I can still see a lot of flicker and space between the scan lines (does that make any sense?).
Hmm, if the 1084s takes normal TV RGB (ie, compatible voltage levels and composite sync) it should work. You can probably even haxx0r up a European or Japanese RGB lead, by taking off the TV connector and using the wires. And the problems with PAL make sense, most PAL TVs can sync to 60hz, but very few NTSC TVs are compatible with 50hz - using RGB does not worsen or improve this, it "merely" solves the issue with different colour carrier frequencies, and provides quite a boost in display quality, imho.
Yes, it's possible an RGB monitor may not be correctly calibrated for 50Hz (i.e. PAL) signals, like how with some PAL TVs they overscan 60Hz signals way too much, or put them slightly out of proportion. But as AntiPasta said, the PS/PS2's RGB outputs are *EXACTLY* what the 1084s take - RGB with composite sync.