I have a luxury condo in the middle of the city for 10,000thb. Next door I have local restaurants and street food to eat for 30-50thb. My water bill comes out to less than 100thb a month. BKK is still very well priced overall, but you need to adapt a bit to fully take advantage. I've cut back big time on wine while im here as wine prices are outrageous as an example.
They are currently renovating the footpaths across phetchaburi between asoke and klongtan Same style as sukhumvit. Hopefully moving the cables underground also