Design company cms? check progress + submit tickets + payment

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.

I've got no idea if it's any good or not, but i saw that this was posted the other day and it looks like it covers pretty much everything you're looking for? (Maybe with the exception of the affiliate system)

Features on that seem nice but seems a little overcomplicated. Will check it further though.