On EQLive there was (untill 2006 at least) a huge difference between having 75 and up, or not.
I havent noticed it here, sorry.
But you could easy test it, just make the same char twice, once with 75 agil, and once with 74.
IMO look at the top 5 list (why not be ambitious), and look for what stat they are in general struggling with.
A personal preference is stun resist. So kill giants for the +5 aug, and do Silver Crown for an other +5 stun resist.