My GP recommended Vagisil lube (it's the same as KY Silk-E, but a bit cheaper off Amazon than that is), and I've found that I can use a LOT less of it and get the same effect, and it doesn't dry out on me like standard KY.
I never used condoms, though... instead we were told to soak our dilators in sterilizing solution afterward. I also bought some of those yeast infection cream applicators (and just discarded the cream itself) and it was a huge help in terms of getting enough lube deep inside; when I was using those, I soaked them in the same sterilizing hibiclens mix as the dilators. Now I just wash my dilators with antibacterial soap, and stopped needing the applicators. If I did use an applicator now, I think I'd probably soak it again, b/c those have more hard-to-clean crevices than a dilator.