I think you made a good decision. Why spend the money if it's not really worth it for you? Sometimes, our desire to acquire something new leads us down the wrong path.

Who knows? Maybe, Kurzweil or some other manufacturer will come out with something very worthwhile soon. In the meantime, you have a great selection of gear for strings & orchestral sounds (Integra-7, Libraries for MoXF, etc...).

Here are demos from Kurzweil's Orchestral ROM block from the K2000. http://www.synthmania.com/Orchestral%20ROM.htm

Here, you can listen to Roland SR-JV80 Expansion Boards and :
http://www.nathansheldon.com/xp-80/expansion-board-demos.html

You may already know about these two sites, but others may not be aware of them, yet.