I don't currently carry a flash at all, and the only standard one I own is a 380EX, which actually kinda works with my 5D3, but is possibly just a little dated :-\. But occasionally I think that owning something for some discrete fill or freezing action would be nice. So what are some good options out there these days? [Doesn't have to be Canon, or cheap, so long as it plays well with my 5D3]. Thanx in advance.