I have 2 suggestions
Having 2 sliders for FTP storage is a little confusing. I would probably combine it into 1, *or* have the plan set a default amount of storage, and then you can just select additional
I would recommend a drop down for FTP port speed. Not many people will probably select 36 Mbps for example, and a drop down will allow you to have discounts for greater speeds. I'd probably go with 1, 2, 3, 4, 5, 10, 20, 30, 40, 50, 100, 150, 200, 250, 300, etc Mbps in the drop down. The faster speeds could be something less than $1/Mbps.