This is a very interesting discussion. Thanks to all who are participating. Here's how I think the input is helping my decisions:
* It seems that people like the Kurz 2500, Roland XP30 (these sounds are included in the JV1010 module from what I understand), and Triton, as well as some other supporting players. But they have to be played right (obviously) and each has drawbacks ... elements of strings each does well and does not.
* There are soundfonts which can be usable if you have the right delivery mechanism ... and it seems a soundblaster card is NOT that mechanism. I'm understanding, then, that a sampler is the right mechanism. I don't own a sampler ...
* There are CD sets of samples available for a hefty price. Again, I don't own a sampler, and if I were to spend that kind of money ...
* The best realistic strings are string instruments themselves. I wouldn't have the patience or inclination to create my own samples. By the time I acquired enough funds to buy high-quality stringed instruments and learned to play them (I am a multi-instrumentalist and can play fretless bass, so the idea of intonation isn't too daunting), I could have worked to earn the money to pay string players to do the job ... no, I could afford them in 1/10th the time it'd take to do it myself.
So, I'm thinking I'll demo some of the keyboards mentioned here (time to look up all my synth-playing friends) ... if I can't make that work and it seems the strings are more important in the overall mix (obviously strings aren't the main event; if they were, of course I'd use the real thing!), then I WILL notate the orchestration and hire the requisite string musicians.
Thanks for all your input.