Dear stack overflow community,
I've been given the task of overhauling a couple of websites for a large corporation I'm working for, as well as developing an internal intranet site for content management and document storage within the organization.
My "problem" is this: They want me to use a framework/set of languages/technologies that I can prove to them are "stable, enterprise-ready technologies with a proven track record."
The spec's "big picture" really isn't too complicated: Implement an enterprise-class CMS for management of each division's web pages that deal mostly with product information and documentation (i.e. a simpler version of www.linksys.com).
As an open-source programmer, I'd like to use Python with TurboGears and build it from scratch, but I can't really find a way to prove to the president that TurboGears has a huge enterprise track record. Zope seems to have a lot of enterprise usage, but it looks a bit bloated to me. Django could be an option, but doesn't seem as flexible as TurboGears.
I'd rather not use PHP, but Drupal has a very nice resume with the "right" names under it (AOL, Sony, MTV); plus it could save me building many of the CMS components from scratch.
Rails might be another option, but I'm not too familiar with it (and as a Python/PHP programmer, Ruby's syntax drives me crazy).
What would the S.O. community suggest for a project like this? I'm sure many of you have faced the same dilemma. What ended up working/not working for you? As I said before, my first choice would be Python, second would be PHP, third would be Rails.
Thank you,
Seth
CMS for a medium-big company is not about Software. It is about proccesses and policies.

Very true! 
Association with prestigious names is not necessarily an indicator of pleasing end results. 
I like Sony products, yes, but on the various occasions on which I have sought support from Sony sites I have felt like banging my head against a brick wall! Those head-cracking sites may not have been Drupal-oriented, I have no idea, but the point is: don't be sucked in by big names alone.
An issue you should expect is: preconceptions of what may be achieved (or constrained) by a system. 
Allow yourself some learning time with Plone — ideally, for a large project such as this, invest in expert advice — and you'll realise that traditional-ish ideas of what a system can or should accomplish are mostly exceeded by Plone's capabilities. 
Gauge user requirements with a very open mind (not based on simplicities such as "I'd like a system that's equal to system x") then come to plone.org | Support | Chat Room to further discuss your requirements.
Framework/CMS suggestions for enterprise website & intranet (I've got to convince the president its solid!)