I'm not in the US so can't understand your problem in identifying a suitable E6 kit. Your old out-of-date films could cause you a lot of problems. You should expect a speed loss, and probably contrast loss too. This would be less of a problem with negatve materials as they are intermediates. Probably a good idea to shoot a small amount of each right away and have professionally procesed to establish useability.
I have used both the Arista and Tentenal E-6 kits from Freestyle and do not notice much difference. I do scan (yea yea *hiss*), so not sure if one might notice more difference if optically printed. Not sure if you will save by mixing your own, but just to state the obvious: the 5L kit is much more cost effective than the 1L kit.
After several years of using kodak 5L e6 kits, I'm now using Tetenal Colortec kits from freestyle. The results are fine. The 50D will have a magenta cast and some (or quite a bit) of dmax loss. but usually correctable in post.
Using old film stock can have that "film look" to it. I shot 10 rolls of 15+ years old Ektarchrome in HK and it's great!
Be different
PM to me if you would like alternative (unofficial) formulae to scratch-mix your own E-6. Be prepared for a fair amount of experimenting and testing using the MacBeth chart, especially for your older stock.
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