Upgrade Route?

[Manip]

I couldn't afford to buy any of the large libraries ... So here is my question... What is the upgrade route so you end up with all the samples?

Is this it:

- Silver
-- Silver Pro XP
--- Gold
---- Gold Pro XP
----- Platinum
------ Platinum Pro XP

And that way you won't duplicate or miss any samples?

[I am aware buying all of them separately is THE most expensive way of doing it]

Edit: Is "Quantum Leap COLOSSUS" the same sample set? Or is that a completely different set?