Which shopping cart system?

[Jay.]

Hi I am planning on putting a website on my Powweb space which is for a Nail & Beauty Salon. I need to find a shopping cart system which will allow people to book treatment ie. a tanning session or having Acrylic nails done. Can anybody recommend a system which will allow the user to select a treatment and a time slot for any given day, and allow them to pay in advance? Once booked the time slot chosen should appear as 'booked'.

Any help much appreciated.

Regards, Jay.