Couple RO questions

[Neuneck]

Higher increase agi means at least, that it'll stay longer and thus reduces the chance it runs out in a bad moment, as well as saving sp when you have to recast it only once every 2 minutes instead of every minute...
I'd go job 50 with most first classes. Back on another server when going job 50 on aco (battle aco) I went to leaf cats. They're quite manageable, although amatsu will be better xp for healbombing.
If you don't think you need agi up any higher go for heal 10 at least... It would be a WASTE if you could go higher and don't.
Only classes that don't need job 50 are thief cls, archer cls and agi knight (as the skilltree for them provides like... 30 skill points?).