I'm primarily a limit player, so I thought I'd seek this forum to see what stats are useful in NL (that aren't used in limit).

Here's what I have:
Allins PreFlop
Allins on Flop
Allins on Turn
Allins on River
Showdown Win% if Allin PreFlop
Showdown Win% if Allin on Flop
Showdown Win% if Allin on Turn
Showdown Win% if Allin on River

Can useful analysis be made from knowing these statistics on an opponent? Or, are there any others that I haven't listed?

Your win % when all in doesnt mean anything. What you might want to track though, is the percentage of times that you were a big favorite when you went all in or called an all in. You cant help what happens after the point that you get him all in, but you can try to make sure you dont get all in as a dog very often.

My goal for this stat is 75-80%. If we get all in preflop with AK vs QQ (coin flip) or we get all in at the turn when we are close to even money then it doesnt count.

I only count hands where Im a big favorite. Like AA vs JJ on a T73 flop.....or AK vs AQ or a A62 flop...or 44 vs KK on a Q74 flop.