It's between that and the 3100. I think the deciding factor will be... what can I find used...I figure if I find a used 3100 and I do need the FSC in the near future, I can sell it and not lose much (or heck... maybe even make a buck).
There is a glut of used framing equipment available now, so you can probably find a good used model 3100. It is a mature design, and there are many in use. Buying used equipment works out OK if you know what you're buying, and if it serves your purpose, and if you know how to adjust it and replace parts that might be needed.
Whether you can profitably upgrade from a 3100 to an FSC later would be a crapshoot. When it comes time to sell that 3100, you may be disappointed with the price you could get for it, and the FSC might cost more by that time.
Also, we tend to keep and use what we have long past the time when we could benefit from better equipment, so you might work inefficiently with your 3100 for some time before you get around to upgrading to the FSC. I have done that myself and know others who have done the same.
You would be lucky to find a used model FSC, because it is a newer design, fewer are in use at this early stage, and those who have bought them are still using them.
My suggestion would be to assess your needs as accurately as you can, and invest now in the machine that will best serve you as far into the future as possible.