I don't use a base so I can't suggest ;_; Bases always make me chip easier. I used some Sally Hansen strengthener before but I forgot what. It worked okay though, Ill find the name later. Only other nail treatment I can suggest is the Dior stuff I mentioned before but it's expensive. It is worth it, and it does last a long long time, though.
My nails are currently painted Mad Max, from Kat Von D's make up line. I'd show a picture but pictures won't show it's true color. It always shows up blue, but theres a purply pink tint to it. It's so pretty ;o;