Option 1 is the best option. And put the Launchbox folder on the SSD for better performance. The static (non spinning disc) memory of an SSD means it operates much faster than a 7200 RPM HDD.
Option 2: You definately do not need another SSD if you have one already. 250GB SSD should be fine. Windows 10 takes up around 60-70 GB, so in my opinion 120GB SSD is a bit small as you are always a little concerned about space.
Option 3: If you are are on a tight budget then this is viable, but an SSD with a new computer is definitely better. SO much faster, windows loads in around 10 seconds, apps load instantaneously. An SSD for OS and Apps (Programs), and a HDD for storage of data is the best option.