server options

[preet]

Hi.

I have got a client who is willing to have a server in his office. Basically there are five computers now which will be connected to the server, to have internet connection and also he has a multi user software for ticketing purpose which has to be accessed from the sever by the five computers or other added in the future. The server has to fast and also backed up easily

Can anyone suggest me which configuration of server should i propose him. I needed one branded and a tailor made.

Thanks