Pick a teacher. The style of Aikido is really good but some teachers are not so good. I really don't know too much about kali so no comment on that one. You really need to see which teachers are good in your area and then pick the best teacher rather than a style especially if you are going for something where details are very important.
Aikido
Krav Maga or Kyushrin
I have a background of Muay Thai but I'm looking for something with more finesse. I was thinking something along the lines of kali or aikido
