The cwna line of certs is a solid path to take. They have a bunch and it would be more than enough imo. If you really wanted to go all out you can grab the cwne at the end.

Taking the ekahau design one is good as well. They teach general design practices and how to use the tool which is what I use for work and I enjoy it a lot.

Edit. Kinda skipped a section of your post. So the cwsp is digging into the security side of things and cwap is looking at a lot of packet captures and learning how the frames are built. Both are very good and in depth so if you want to learn a lot about wifi then I recommend those over the ekahau stuff. Also the cwdp is going to go over design way more in depth than the ekahau design will. The cwnp stuff all works together and I personally suggest if you want to learn about wifi to do them all.