The FX700 is definitely better than the TF10, but the cost is higher as well.
If you have the cash and isolation is not an important factor, then I'd highly recommend them. Awesome treble and spacy, airy soundstage. Like a concert in your head.
The TF10s are wide, but the sound can seem like its coming a bit from behind rather than normally left and right. I find the height lacking as well.
Personally, I'd try to find the FX700s used because of the cost...