Dear,
I understand your requirements and for this project I would use YUI PureCSS responsive framework which have small size.
I'm interested to learn more about your project and, for start, I would be thankful if you could answer on a few questions:
* How many pages your site have?
* Does it have or need any special functionality (except as noted in project description)?
* What is time limit for finishing this project?
I graduated in New computer techonologies (School of Electrical Engineering and Computer Science of Applied Studies) and I've been working in IT field for over 14 years (PC Assembly Technician, VOIP administrator, System/Network Administrator, Intranet projects), and last 6 years as a web developer (mostly using WordPress as a platform).
Regards,
Ivan