I'm working on significantly large application using FASTCGI (python, php, and perl scripts).

I've been debating between Worker MPM and Lighttpd with the multi-thread features enabled.

I need some thoughts on the subject.

Production servers (x2):
X3360 Processor
8GB DDR2 800 Memory
4x 500GB 7200RPM Caviars in a Raid 10 Hardware
CentOS 5.4 x64

NGINX Proxy bridges them together.
External MySQL
No /tmp usage at all for sessions - pure database driven.

In this type of setup what webserver would you recommend?

I'm looking for the most performance I can possibly squeeze out of it, so which httpd do you think I should use?

These servers will also serve the static content (css, images, js, ect ect).