EvilDragon, thanks for the additional information. So it seems like they improved their technology, but also changed their overall sound by using more "realistic" samples in the Trinity and Triton. But I don't think it can be said that a synth with newer technology always "sounds" better than the old ones. Of course you can do more realistic piano sounds on a Motif than on a D-50, but the D-50 has other areas where it shines, even if it doesn't have the same amount of effects and features as the Motif.
Thing is, I definitely do not want these synths for their acoustic instrument emulations, but rather for their unique digital sounds like DynaPiano, FirstLight, glassy pads and late 80s/early 90s stuff like that. And if the Trinity doesn't have the same "family" of sounds, it's a totally different "sound" than I am looking for, even if it sounds cleaner. Correct me if I'm wrong, but I think Korg dramatically changed their sound set when they released the Trinity, and went for more realism and acoustic emulations instead of unique 80s or more synth-like sounds.
If I wanted a realistic trumpet for example, I'd use an advanced sampler or sample modeling technology on my computer instead of a 90s synth
Oh, and paugui, by that logic a DX7 should be worth $5000 or more, as it is even more "vintage", but that doesn't really make sense, don't you think?