That armor is not usable for the 501. At the moment only the Training outfit will be accepted.
As I mentioned I am not going to be able to pursue any costume for the near future untill I find a job. After that though, my short list is:
501 quality starkiller and a Clone Wars Anakin by Celebration V,
Then, Halo 1 Master Chief
Then Ghostbuster,
Then Jango.