In my opinion, the voices in the Kurzweil are stunning! The piano or piano combined with strings are amongst the BEST you'll ever hear in a keyboard (in my opinion - but do check what others say about the Kurzweil sound).
eBay
A Kurzweil PC3A8 in great condition, mainly used for home practice. Comes with the amazing Kurzweil sounds (including their concert grand piano) already installed and in full working order. Some minor scratches, mainly on the sideboards (pictured). Selling due to upgrade.
eBay
Here is my Kurzweil PC 3K7 synthesiser. I bought it new just before lockdown so it has sat in this soft case since then unused. It coes with it's sustain pedal - which I forgot to photograph - and a mains power cable, also this soft case which is older than the synth but I'm throwing it in for free.
eBay
Kurzweil Mark 5 Ensemble Grand. Used many years ago and is kept in very good condition - just the amplifier is not working . I was told that there is inside the system a battery which needs charging or replacing and that could be the problem but I haven’t done anything as I don’t have time for it ..There is noise coming out when I plug in but no sound is coming out ..Could be a small fix and up and running It comes as one unit and needs 2 people to lift it as heavy
eBay