I've spent mine on life, critical hits and nerve. Ultimately you need to figure out which play style you're making your account go towards and select an upgrade that benefits that style most.
I'm on the verge of resetting mine as I think they'll be better spent elsewhere, though, I'm coming through to completing the combat bachelor which will enable me to earn experience on my guns, as such I think I'm going to go for:
Go for 9/10 wherever you have 10/10 on your list... if you do that, you can also increase Nerve to 9/10 and still have merits left over for something else. ;)
I nearly maxed EDU (9), and now I'm halfway to max Bank Interest. For those who maxed Crit Rate, are you seeing an appreciable increase? I'm trying to decide between Life and Crits for the next push.