Want a very cost effective synth/sampler with no improvements considering RAM, note polyphony since 1996 ?

Buy a K 2500 or 2600.

Sincerely, you'd better look at Emu 5000
or Yamaha A5000
(Akai S6000 buggs, even the new OS 1.30)

Kurzweil should wake up and and propose a sort of K3000 : 128 voices polyphony, ...