Hi Star trek, I do not know much about Nest Builders but I can suggest you a few builders that provide great quality and ammenities. I go for quality and services. I recently bought a flat at Mahindra Lifespaces Aqualily. It is an incredible place located within Mahindra World City, they have an some amazing facilities. Haven't faced any problem with them till date. You should have a look.
The company has won several awards such as the "Best affordable homes of the year 2013" awarded by DHFL. They are an ISO 2001:2008 certified company rated by CRISIL for our standards and quality. Other renowned accreditation include certifications by Builders associations' of India and IGBC (Indian green building council). Which project are you looking for?