CMS With Forum for building a community [soliciting recommendations]

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http://www.linuxquestions.org – I run a website which is based around a myBB (after converting from phpBB2). I am looking for a better option to offer content to my members and am considering either a portal or CMS type of software. Since I know there are many out there and each have their pro's and con's, I'd like to solicit recommendations based on requirements. Must run on Linux, since I have root, it doesn't matter on the pre-reqs since I can install whatever I need. Would rather it have a build in forum rather than having a "hook" or a "bridge" to an external forum. (HowTos)