Thank you everyone for the reply.
I was afraid that I had to use an e-commerce package for this, as it just seems like an overkill on server resources, but with today's server specs, I can make do with it. It's just that I have to dedicate another licence fee to my current e-commerce software to this small project, for a client (he doesn't really want to pay for it, as we're both quite web tech savvy enough to know it's overkill).
I will take a look at ModX, but probably won't go for that due to time constraints..
Do you have other CMS recommendations?