There aren't any attributes that matter for a SMN main, similar for other category. Enmity down is decent. Max MP obviously. Summoning skill as well, obviously. The rest, you can pick as you like. STR would help if you melee at all. MND would make cures/stoneskin/etc ever-so-slightly more powerful. I wouldn't even start thinking about that stuff until you're 10/10 on Summoner-specific merits and 8/8 on summoning skill.
____________________________Pergatory (Asura, Kupo LS) WHM99 ~ SMN99 ~ DRK99 "If you want to know me, look inside your heart." -Lao Tzu