Davy D said:
Help me understand what you mean with the humbucker being too close to the bridge. Got a pic? Other than that, if you can snag it for $550 I say do it if you are secure about the above mentioned issue.
***NEITHER OF THESE ARE THE EXACT MUSTANG I'M LOOKING TO BUY***

^^ This is an example of what I've heard as "the humbucker being too close to the bridge" producing too much of a twangy bright sound and making it more difficult to dial in tones.

^^ Notice on this one that there is a nice small gap between the bridge and the humbucker route, including an extra spot for a screw in there. I have heard that this is the ideal setup and it is alot nicer for dialing in tones.
Although, since I already have a Jag-Stang with a HS setup, I am thinking about maybe buying that Olympic White Mustang and taking it back to a SS setup and get a Lace Sensor red for the bridge and a Lace Sensor silver for the neck. Thanks for your help Davy D, or your effort nonetheless. I hope you can better understand the humbucker issue I was talking about.