My monthly costs:
Loan repayment - £141 (I did extend the term for other things too).
Insurance - £42
Petrol - depends. Girlfriend lives away from me and can do that trip maybe twice a month at £30 a time, but before that I'll put about £100 per month in.
AA - £7.** a month
Tax = (at £129 every six months) £21.50
MOT - £30
Maintainance is a bit random - due to tyres, cambelt/aux belt kit and usual fluids and stuff it would be artificially high this year (well lets hope so anyway!). I would say over the 2 years I've owned the car though, it's needed general servicing, about three tyres, cam belt kit etc, exhaust so per month so far it's probably cost me about £35.
So between £409 and £349 and that's a decent wedge out of my wage at the moment.