"Russian Sust" - If you're talking about Cytahohs, I've never heard anything bad about them. Lots of fakes, but the real ones are good. Same with the Niles, who said they suck?
If you're going to mix Cypionate and Enanthate there should be no problem at all. Personally I would do one till they were gone, then switch to the other, but I don't really think it makes a difference.