I was wanting to set up a webdesign company and was wondering if there is a cms/script which would be suitable. The content side of things could be managed in wordpress ( basically static pages and dynamic sidebars, pretty simple).

However I wanted a client area where clients can sign in, check status of their design, submit support tickets, access faqs, pay through credit card/paypal/cheque. Also an affiliate system would be nice. The features are somewhat similar to a hosting company but slightly different.

Any help is greatly appreciated.