Best Thai Drama you've watched?

Full House!!!The best ever!,,
Duang Jai Akkane- I Loved this one. 
Kiss me- Very good too!
Leh Nangfah- Very Unique fantasy 
Lom Sorn Ruk- Very cute 

Full House is a really well-rounded romance story.
I agree with DMC on Duang Jai Akkanee as well.

@leemijin - me too :) I loved it !!
Kiss Me was good too. But not as good as Full House.

I only watched a few of them, but my absolute favourite is Ugly Duckling Series: Perfect Match so far. :)

These are shows that I highly recommend, but I'm not sure there are Eng subs available for some of them. If you run into a roadblock, just PM! I could try asking around from subbers.
Padiwarada - James Ji & Bella Ranee
Sapai Jao 2015
Mafia Luerd Mungkorn series (I see you mentioned Singha)
Wanida
Neung Nai Suang - 2005 version
Prissana - starring Tik & Taya
Sood Sanae Ha - Ken & Anne
The Ugly Duckling series - Boy's Paradise is my favourite
Leh Ratree - Both versions, but 2015 was better
Spinisters vs Casanova - About modern ladies in their 30s
Ngao Asoke - 1999 ver
Jao Sao Chapor Kit 

Kluen Cheewit - just finished a few hours ago. Never seen such a great drama! 
Full House - watched a few months ago, binged my way through it. 

I just finished Game Rai Game Rak sometime last week. I practically binged my way through this one as I found it very interesting and I'd never watched a drama like this one before.