How much to charge?

I haven't built a website for someone in a long time but a guy wants me to build a somewhat simple one.

Basically what it will have is:
- custom design
- store locator
- godaddy shopping cart
- cms
- initial pages creation and adding his content (i.e. about us, contact us, faq)
- possibly a few other add-ons

Pretty basic stuff but I still have no idea what type of quote I should give him. I'd assume I could do it all in a matter of 10 hours but I don't want to overcharge him nor do I want to screw myself by lowballing.

What do you think?

If I were you I would check the price quotes on elance and scriptlance. That should give you a very good idea what's the current price.

If you can't find you can post the job there just to get some price quotes.