I have quite a few species of wild bettas, and honestly the care involved is way easier than that of my splendens. They are much less neurotic, and if tank-bred, are not as fussy about water conditions and diet.
The IBC website as well as Seriously Fish have a lot of good basic info on wild species. I personally prefer wilds from the coccina complex (often called Clarets because of their colour) but the larger mouthbrooders are also nice.
The good thing about wilds is most species can be kept in pairs/groups without much aggression at all.
At the moment I am growing out some albi fry, and waiting on my strohi and channiodes males to release.
Here's a photo of my Betta livida male as an example of how tame they can become once used to your presence