We are looking to add a large boring mill to our shop. Our primary product is Hydro electric turbines.
We currently have a FPT with a heidenhain 430 control. With 2gb of expanded memory. Some of our programs are over 100mb in size.

We are looking at 2 machines,
One has a Fanuc 31i-A
The other Fanuc 16i-MB

What are our options in terms of expanded memory on each?
Are they both smooth in complex surfacing applications (NURBS and Splines)?