Hey Kopite
Have you check out http://www.phacharasuites.com/
I think some of there rooms have a balcony and some even have a terrace
Its very close to NANA , its around the corner, and close to the skytrain
Check out the One Bedroom suit
I stayed at this place last year and I liked it.
I did notice that not all rooms have a separate shower though and if that's a must (is for me)
you should inquire with reception
check out this brilliant trip report on PA
http://www.pattaya-addicts.com/forum/topic/125106-temujin%E2%80%99s-tails-%E2%80%93-chapter-7-the-2nd-50th-birthday-bash-week-final-update/
It has picture of one of the balcony rooms