That is a decent budget, €100 a night, or around 4000baht. A couple of suggestions if you want to spend that much
The Royal Phawadee comes in your budget, superior room with extra bed. Looks a nice place only opened about a year ago.
http://www.royal-phawadee-village.com/home.html
Also the Salathai Hotel opposite the Phawadee has a Junior suite around the same price
Phuket hotels and resorts - Salathai Resort - Pictures and Facilities