Perfect Forward Secrecy requires Apache 2.2 on Debian Wheezy, or Apache 2.4+ for other distros.
Below is a good configuration to use which I have tested and used on Debian Wheezy:
SSLProtocol TLSv1 TLSv1.1 TLSv1.2 -SSLv2 -SSLv3 SSLHonorCipherOrder On SSLCipherSuite AES256+EECDH:AES256+EDH
This can then be tested on https://www.ssllabs.com/ssltest
A good reference is: Category: linux sysadmin Tags: apache, ciphers, https, linux, perfect forward security, PFS, security, SSL, tls, web server