maybe. a 10 user licensed pix 501 will allow a max of 10 hosts to talk thru the pix to the outside world.
A 10 user 501 will retail for around 400US street. If you are expecting growth, look at the 50 user.
All pix 501s, whether 10, 50 or unlimited users allow a maximum of 10 concurrent vpn tunnels, whether they are site to site vpn tunnels, or end user vpn tunnels.