Thank you Gents, I appreciate it.
I apologise for the belated reply, I haven't gotten a lot painted as my father-in-law started to go downhill very quickly in November (cancer) and we just buried him the day before yesterday. So, obviously, hobby and everything went on the back burner.
@Christopher, yes I've been working that part of the equation out. I've decided to mix for the "Enemies of Rome." Magister Militum actually has a fairly large selection for all sorts of different armies in 10mm for this period. The problem I've always had with MM (in 15mm) is that they are a bit skinny when compared with other manufacturers and can look a bit odd when mixed. Which is a shame because I think the MM minis actually have the most realistic proportions and everyone else is a bit bulky comparatively.
That doesn't yet seem to be an issue with this scale. Since the packs are still relatively inexpensive, I picked up some Franks, Saxons, and Huns just to try them out. I also found some Goth and Hun cavalry on Col. Bills used mini site, they were Old Glory. And The Baggage Train has a nice selection of Goths and they were kind enough to send me some sample. I liked their Goths as well as their terrain and placed a nice sized order back in October but still awaiting their arrival. The proprietor wrote to me and has been seriously ill for a few weeks and is behind, so I told him to take his time and that I've lot's to paint to keep me busy in the meantime.
I also used selected Pendraken Dacian figures for javelin skirmishers and light cavalry. Their Saxons are also nice.
For Post-Roman Britain, 5th century Gaul, Spain, etc. I've decided to go with the theory of political entities rather than ethnic entities, i.e. lot's of original inhabitants assimilated into whatever barbarian group took over and called themselves that. So for me, that means that I can mix Saxon and LR/Romano-British "militia" for an "Arthurian" army; Goth, Hun, LR Equites for a comitatus, etc.
I have a few more units painted for this post but the weather is preventing me from spraying them with Aegis Suite and "fixing" the flocking. It's too cold and damp and there is a high risk of frosting the minis right now. So when it gets warmer I can do that and post more of the units I've gotten done.
In any case, they seem to all mix well enough not to look too odd or out of place.