As I said, even though I'm going to buy a XV 5080 (for sample loading and 128 voices polyphony), I keep my JV 2080.
Why ? Because we elle know that 128 voices polyphony DOES NOT MEAN 128 NOTES POLYPHONY.
I mean, play very fast 4 chords of 5 notes of strings made with 4 tones : you eat 80 notes polyphony !!!
Considering the timing of JV 2080 : Ok if you use it with more than 8 parts playing simultanously you get delay.
But about this delay, I could write hours about it. I made a doctorate about Midi timing problems. See I own Mac, PC and Atari.
Want to get rid of these problems ? Use an Atari with Notator SL.
I sometimes do. But I more often use Cubase VST, Digital Performer, Logic on Mac and PC and it's true I get delay in the conditions written upper.
I still say XV 88 and XV 3080 both lack all the options we find in the XV 5080.
XV 88 is too expensive considering what it can really do.
About the K 2600 : Sorry I own for many years Kurzweil Px 1000+, Pro2 and Gx 1000 modules.
I found many of those sounds in the K 2600 (with better AD DA converters, true).Remember it has only 8 megas of rom (+ 4M° for the piano = 12 M°)
You know what is Kurz technology ? They say, the most important stuff is to emulate the sounds in the fist miliseconds so that the ear doe not need a long sample that takes too much memory. It was a great idea in the 80's when technology and rom was exepensive. But nox it appears obsolete. Synth power in k 2500 is not that strong... You only find hundreds of templates for the enveloppe you look after BUT never the ONE you really want or need...
Drums kill but not choirs, voices and even strings you can get as good in the Roland JV or XV.
I know very famous composers. They all have a K 2500 (not 2600). BUT They use the Roland Library (s760+ samples or JV 2080 with cards) to score movies and add some ensembles to real orchestras.
Touché !
Enjoy.
best regards to all