the only one I really know out of all of these is Phetwason.
He won Raja Stadium fighter of the year award last year after beating the likes of Superbank, Petnamngam, Petdam, Pettaksin and Rungkao himself - all in dominant fashion - and drawing with Tawanchay. Then he beat Kaonar and got the fight against Pet-U-Thong earlier this year and got kind of outclassed. Last I heard he rematched Kaonar at one of those Pheonix Shows and looked completely lackluster and lost (it was the fight where the commentators had their names switched until the 3rd or 4th round);
I really like his style, he is tall, lanky and awkward looking but employs a quite technical style. Throws a lot of straight rights off the round kick and has caught guys by surprise with that punch a lot of times.
Here are some fights:
vs. Petdam
vs. Petnamngam
vs. Tawanchay