Applescript ScriptUI or Flex (hesitations)

Hi Guys,
I wrote applescript scripts that my customer is happy with. We chose applescript as the script was aimed to work with QuarkXpress and Indesign on mac platforms.
But as native applescript is quite limited in the interface area, they want to turn into Javascript extended abilities regarding to Interface Creation. I am ok with that. The only concern I have is that the Applescript codes were executing system operations such as zipping/unzipping, http connections (curl in a do shell script), remove files...
I know you can execute applescript with javascript and doScript (in a mac environment of course) and I have to run some tests. However, as I want to dig with Flex as much as possible from now, I thought I could use it instead of ScriptUI.
BUT whatever I use ScriptUI or Flex, I have no certitudes that they will do what I need them to do like I explained above. Do you have any feedback on this topic ? Is one of these technologies more appropriate ? Maybe none of these can do the trick ?
Any advice would be welcome.
Loic

Hi and thanks a lot Shane and Harbs for your helpful answers,
Ok, I have now great material and indications to dig further.
One last thing Harbs, I was told Applescript studio project couldn't be ran from Indesign.
http://macscripter.net/viewtopic.php?id=34296
Because the main problem is that teh customer wants some widgets that standard Applescript can't offer (Dropdowns, checkbox...). So Applescript Studio looked like the solution but it seemed like it could be only used as an external software.
Loic

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Does it make sense?
@+
Marc

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We are proud to announce to our fellow scripters that our breakthrough product RapidScriptUI is now available for download at http://www.scriptui.com.
We are convinced that our product will make it considerably easier to create ScriptUI code without having to write the error prone code.
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