Kidney Puncher and Advanced Vapor Supply both carry high quality wire. Also premade coils that can be excellent.
I used up ALL the kanthal in my coilmaster's kit practicing how to make coils. You may find it easiest with SS to anneal the wire (heat it with something, a blowtorch, a gas stove etc.) that makes it less "springy" and easier to work with. You don't have to go nuts, but heating it a bit will cut down on that annoying springiness. I did find SS a bit harder to coil than kanthal, although I've gotten used to it the more I build rebuildables.
Best of luck, and by all means, use your kanthal for experiments, it's what I did. SS properties are slightly different so you may want to practice your "SS desired build" in terms of wraps, coil diameter and etc. I mean, calculate out how many wraps you will need on steam-engine.org, and then wrap the kanthal as IF it were SS you were using, so number of wraps, space or contact and etc. IDK, it's just a thought.
Anna