I know there's the change title item, but I don't wan't to give my members the choice of changing the custom title themselves. For example I wan't them to buy a specific Custom Title.
Example: Purchase Custom Title: I pwn teh world! - 1000 Credits
So they pay 1000 Credits and they will have they're current Custom Title changed to "I pwn teh world!" or if they haven't had a custom title before this gets added to their profile.
(Of course I'll be sure the members permissions so that they cannot change their own title willingly.)
I also want to make sure that the member cannot buy a certain title until they have another title item in their inventory.
For example to buy Custom Title: "Level 7 - Lucky 7", a member will have to have 6 other Custom titles purchased, 1 through 6, to be able to purchase the Level 7 title.