Hi WellRed,
I guess people don't come to Bali to find working girls.. there are more famous place in Asia for that. But I understand where you coming from. There are a few blogs where you can find all you need for this kind of trade.
In a nice bar with view on the beach on Seminyak a Heineken bottle will cost you 45K.. that would be 3 euros. Nice view+posh bar + seminyak probably means it's the most expensive in bali. Bintang, local beer will be 2 euros.
Nice Nasi Goreng in a local warung (nice one ) will cost you less that 3 euros.
For top class bars liquors will be around 6 euros.
Converting from Thai bath your budget is 150 to 200 euros... that's a lot. With that budget you can go to a top top restaurant, get a massage, have more than a few drinks and still have some spare.
You can get a car with a driver. It will cost you around 25 euros for the whole day, you can visit all the temples etc.. and the driver can give you advice on where to go at night, what to pay to get a drink and possibly some company.
I hate pattaya (only prostitutes, army guys and old men.. it's dirty, twice more expensive than Bangkok...).. been there once, never seen the point to return.
There are girls available in Bali like everywhere else, but I guess the style is less agressive than Thailand. If you are alone, taking your driver along can save you some embarassment and help you to get translation if needed (this works when you visit temples, bars or night bars). Not all girls come with a price tag. And you can find company with local or other fellow visitors.
From what I heard Sanur is not the most happening place. Biggest parties are in Kuta and Seminyak. But Kuta is the least Balinese of all, with all those bogans wearing their Bintang wife beaters... if they were any t-shirt at all... I find the food crap there... it's nothing like Bali at all... obviously with all this crowd on demand, come offers from working girls.
But for me the best of Bali is to sink in the atmosphere, relax, do massage, get lost in the small roads in the middle of paddy fields, eat well and practice sports ...