How does DSP improve the 5000's? Clarity? In what areas do some perceive that 5200's improve bass? Tighter? Or, heavier?
I don't know the D5000s - before my time

- but from what I've read, DSP adds a lot particularly in driver integration. I have MkI (18-bit) DSP5000s which have strengths in the treble-mid integration that, for me, outweigh the weakness in the bass (the mid cone shares its amp with the bass cone and the amp struggles). I redirect all sub-80Hz bass to my sub. Back on topic, the 5200s are, in summary, 21st century technology and sound it. Basically they are that bit better all round. Three 5200s can image startlingly well.
Does Meridian make an excellent DVD/CD player under $8,000 or GBP 5000?
The general consensus is that the G91 DVD controller and G98 DVD transport are sonically
outstanding. I have heard nothing more lifelike than DVD-A from a G98 through a G68 to 5200s. Video is also excellent, but probably not state of the art (search this forum) and bettered by cheaper alternatives. Also too many reports of flaky firmware for my liking (disc recognition/navigation etc.), so I'm going the SDI modified DVD player + external scaler route for video. However, if someone handed me a G98 to go with my G68 I wouldn't say no!
Incidentally, I listen to most of my music in the form of
EAC -ripped uncompressed WAVs on hard disc wirelessly via a Squeezebox. As good as a CD transport in my opinion.
Is the G series really that good?
The G68 processor is probably the star of the show. I'm biased as I have one, but it
is a superb processor that borrows much from the 861. The G08 upsampling CD player is also reputed to be pretty special. As I said above, sonically, you'll be hard pressed to find better audio players than the G91 and G98 (800 and 808 excepted).
Does the 500 series still exist, outside ebay.
Probably not. Unfortunately, you're about six months late... Worth looking around though. I'm sure some dealer somewhere has some stock left.
I hope this doesn't test your patience too much.
I've learnt so much from others on this forum, I feel it's almost a duty to pass on what I've learnt! And my opinions too
Good luck!