A good will save is more of a luxury than anything else in a gladiator style arena battle.
I also think you don't really need those skillpoints either in such a situation.
You really need those feats, so imp. initiative sounds like a too expensive investment (then again, high dex AND imp. initiative sound really nice).
If you're going to wear heavy armor, i'd rather spend a feat on armor optimisation than imp. initiative (since you'll also improve your movement rate and reduce armor check penalties). But i'd go for 16 dex and a breastplate.
I also think you don't really need those skillpoints either in such a situation.
You really need those feats, so imp. initiative sounds like a too expensive investment (then again, high dex AND imp. initiative sound really nice).
If you're going to wear heavy armor, i'd rather spend a feat on armor optimisation than imp. initiative (since you'll also improve your movement rate and reduce armor check penalties). But i'd go for 16 dex and a breastplate.