I know that many hostting companies offer CentOS 6 as their OS of choice for VPS do to its great track record. So I decided to write and maintain a guide for getting a Development environment for Metasploit Framework or for those that prefer to use only the OSS versions of it in CentOS 6 the guide also covers RHEL 6 for both x86 and x64 versions. http://www.darkoperator.com/msf-centosrhel/
Hope you find it useful.