James,
I have been using Foxspell for quite a few years and it seems to be adequate for the job. I had some issues integrating in the manner the manual suggests, but nontheless, I got it to work as I needed it to. Not an overwhelming recommendation, but it is solid and should work for you.
I didn't like it when I upgraded from FPW 2.6 to VFP, they made me pay full price for the spell check update. Other then that no complaints.
Kevin