This might be a very late reply but just in case you are still searching for resort or villa you can visit this site http://www.thailandholidayhomes.co.uk They have all sort of villas/resort and condos. Infact, i've already tried thier service and it is highly recommended.
you can call or go to the website www.resort.papillonkohsamui.com it's a beautiful resort in the north oh chaweng beach , i've passed 2 Weeks this summer , they have bungalows with two rooms , the place is beautiful front of the sea. Have good trip !!
We just stayed at the bhundari resort in Samui, very lovely and they have two bedrooms suites with pool or without. Just lovely and very hospitable. You should get a good rate only 50% occupancy. Just out of Chaweeng