Choosing which folder to save downloaded files to as soon as file is downloaded?

Question

I'm completely new to this so if there's a simple solution to this, do forgive me and thanks in advance for your patience!
So I've just started messing about with Automator today and read about Applescript.
I'm basically trying to find a way of having a prompt for me to select which folder I'd like to save downloaded files to, as soon as the files are downloaded into that folder.
I've tried a couple of things:
Setting up a Folder Action in Automator for my Downloads folder.
'Revealing items in Finder'
'Get selected items in Finder' (thinking that this somehow grabs the items that were revealed and selected in the previous step)
Then running an Applescript (as an 'action' in Automator) to do something like this:    
on adding folder items to this_folder after receiving these_items
  tell application "Finder"
  set the destination_folder to [choose folder with prompt choose folder]
  end tell
end adding folder items to
Or something like this:
on run {input, parameters}
  tell application "Finder"
  select files
  move files to [choose folder with prompt choose folder]
  end tell
  return input
end run
As you can probably tell, I really haven't a clue (although this is addictive and I can't deny I'm enjoying myself)... I've tried a few more variations based on scripts I've seen dotted around the web doing similar things but I didn't hold on to them so I can't show you them. The script  actually runs really smoothly, and runs through with no errors - I copy a file into my downloads folder (to test) from another folder. The Downloads folder opens up automatically, selects and shows me the file I've just added then pops up with the window prompting me to choose a folder. It's just that when I do end up choosing the folder, the file doesn't move at all. The window disappears then pops back up again, then disappears after I press 'Choose' for the second time, as though something has happened. I suppose the files that the Finder revealed, selected and 'got' had no connection to the following action/script?
What do I need to change? As I said, completely new to all of this so please do treat me like I'm a bit stupid!
Thanks!

Answer 1

Others have already given alternative pointers to solve your specific problem, but I can understand the desire to roll your own
From your script samples, you're on the right track, but are missing a couple of key concepts. I'll try to clarify.
Your script:
on adding folder items to this_folder after receiving these_items
  tell application "Finder"
  set the destination_folder to [choose folder with prompt choose folder]
  end tell
end adding folder items to
First up, let's correct that 'choose folder' command. Specifically, the prompt - it should be a string (enclosed in quotes). As it stands, conceptually, you're kind of invoking 'choose folder' again, and the result of that is used as the prompt on the first 'choose folder'. Not going to work so well.
Instead, your choose folder should look more like:
  set the destination_folder to choose folder with prompt "Select a folder:"
Note how I've quoted the text and now it's interpreted correctly - the selected folder will now be stored in destination_folder.
Now that you have the destination folder, what you need is the files to move. Fortunately, Folder Actions provide this for you in the way the command is called:
on adding folder items to this_folder after receiving these_items
In this case, these_items is a list of the newly added files., so all you need to do is move these files to the destination_folder:
on adding folder items to this_folder after receiving these_items
  set the destination_folder to choose folder with prompt "Select a folder:"
  tell application "Finder"
  move these_items to folder destination_folder
  end tell
end adding folder items to
Note how I've moved the 'choose folder' line outside of the 'tell application "Finder"' block - there's no need for it to be in there, and this way it will prevent the context switch where the Finder comes active to ask you for the folder.
Incidentally, this is a 'pure' AppleScript implementation, not an Automator action. The Automator action would be radically different in that the files would be passed into your workflow - you'd need to store these in a variable, then prompt for the destination folder and store that in another variable, then use the move Finder items action to move the files, like:
Personally, I prefer the AppleScript option