You can set up a script to be performed by the OnObjectSave trigger on your drop down list field.
Go to Layout [YourTable::YourDropDownField ]
This uses the "Layout name by calculation option" and requires that the names in your drop down exactly match the names of your layouts.
If [YourTable::YourDropDownField = "Fred" ]
Go to Layout [//specify layout for Fred here]
Else IF [YourTable::YourDropDownField = "John" ]
Go to Layout [//specify layout for John here]
And so forth...
the second option uses a more complex script but does not require that the layout names exactly match values in your value list. It also would permit you to send more than one user to the same layout.
Your first option did the trick. This worked perfectly for what i needed. Thank you very much!