i need your help in this Price offer

Hello

I need your help to put an estimated price offer for a dynamic web site.

My client has a very ugly static web site for selling computer accessories.

He asked a price offer for the following contents:

1- dynamic web site ( data base for the products and the ability to search the contents )
2- shopping cart + order alert
3- data base for his clients ( username and password )
4- guest book
5- software library
6- forum ( php )
7- mail form
8- php-nuke magazine

I can do all this work , but this will take time and effort from me .

The prices differ but there is an average, I do not want to loose this client even if I will give him a lower price than the average.

That is my first "real" offer, and I need your help.

Thank you for your time.