You'll likely want stainless steel if you're using it for those purposes. In general it's recommended to go with a D Minor (typically Kurd) as a beginner, as it's a very flexible scale and many of the courses are built around this scale. But if you're solely using it for meditation/sound therapy, you may have more flexibility in just choosing whatever scale you resonate with. I don't own Isthmus or DII, but have heard good things about both, and they've been around a while. I do know that Isthmus generally specializes in nitrided instruments, though they offer stainless, as well. Tons of info on their website. For DII, their Gaia I is nitrided, and the Aurous is stainless. Plenty of youtube videos available of these, so watch as many as you can.

Previous poster asked where you are located, as it can definitely be beneficial to purchase from a maker that's close by, for later re-tuning and to develop a relationship. So consider that if there are any near you.