Hi.
For smaller Channa, there is a great deal to choose from!
If you want something relatively easy to care for, the Channa Simonas recommended is perfect. You could add Bleheri, Assam, Gachua to that list also.
If you fancy something a little more challenging (quite a bit challenging) then Blue Moon Galaxy, or Fire & Ice are well worth the extra care needed.
IMO, these two are the most beautiful of the smaller Channa, possibly the most beautiful full stop!