In November , accomodation prices start to rise as the better weather approaches. A quality beachfront property will cost from 3500-5000 baht per room per night ,on, or near to one of the main beaches. If you dont mind being either a little away from the main action or in the thick of things but a few streets away from the beach, you can pick up reasonable standard accomadation for 2000-3000 baht per night. Within these prices, you will get a nice room with reasonable facilities (pools,bars,room service etc) and generally a buffet breakfast for 2.
AS far as spending money go's, you can eat reasonably well with a few beers to wash it down for as little as 500baht per person per day or live like a king/queen for 2000baht. Throw in a daily massage and a little shopping and your spend could be 3000 baht. The pleasures of Thailand are many and generally alot cheaper than prices at home, so I would advise you to be flexible in your budget, go on all the rides and you will definately have a great time.

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I love Thailand this much