May be a little late for my 2 cents, and a tad redundant; but I would go with the END first. I have found the extra def and HP invaluable. Especially in KQ's like Robo and Spider where you might pull a lot of healing aggro. I often use stones/potions to keep myself alive in those cases while still healing the tank and/or others.
As my level has gotten higher I've started adding some SPR to help with more MP and the few occasions I solo.
Overall though there are good arguments for some STR too. Experiment a little and remember you now have a quest (at lv 20 I think?) that gives a 10 point stat reset scroll. So you can experiment some with STR or even DEX and see if they do much for you and switch them if not. Beyond that "free" 10 point scroll you can buy some, but why spend money if you don't have to.
|