Since you already own a Spyderco, I'd recommend a Delica for EDC. Choose whichever variation you like best, they are all great. It's my favourite knife in its size, I never buy duplicates but I somehow ended up with 4 Delicas.
For SD I think you should first get some training and then choose a knife. And keep it legal. If, God forbid, you find yourself in a situation where you have to defend yourself with your knife an illegal blade can turn a clean cut SD case into a legal nightmare. Knives are just tools and a small part of an SD system, packing a big scary knife with no training won't help you too much.
With that being said, I try to keep my SD knives similar to my utility knives (many fulfill both roles) so that I can build the muscle memory necesary to deploy them quickly. Look of some Michael Janich videos, and you'll see that the humble Delica can get the job done if needed. Also, get a training version of whatever knife you choose. I know a lot of guys who carry folders but practice with rubber fixed blades, a good folding trainer is worth its weight in gold and it will help you realize how hard it is to get your folding knife into action in a real fight.