Can anyone recommend a GUI for arcpy? So if I want to run my script as an exe with some blank text boxes(or text boxes with default entries), radio buttons, check boxes etc.
Running your script as a standalone .exe is a separate matter, and you may want to look at this link first as it has some gotchas playing nice with arcgisscripting: Compiling Python Scripts that use ArcGIS Geoprocessing Tools?
You also might want to try Rapyd-Tk http://www.bitflipper.ca/rapyd/
This is a GUI form builder that uses Tkinter.