You should plan out your build according to the 2nd job you want (elementor or psykeeper); figure out how much int and sta you want to have by lvl 60 or 65. Then, build your mage INT first, the more int you have early on the easier it will be to lvl your mage but do not add more than you plan to have by 60 or 65. In other words, say you want to be an elementor with 80sta and 78int by lvl 65, pump your int to 78 first then work on sta.
Visit this link, you find links and info about eles, psys, and mages that should be of some help to you.