2 questions on the Cisco PIX 501 Security Appliance

I'm looking at buying a Cisco PIX 501 Security Appliance and I have 2 questions.

1:  I wanted to know if anybody had any experience with this or a similar model and whether this would be a good fit for our business.  We are a small business with about 70 employees.  However, only about 5 employees will need to access the network from home or on the road.  They would be accessing our Windows 2000 file server and possibly their desktops using remote desktop.  

2:  We currently are using  Smoothwall Firewall software for our firewall.  When I called Cisco Sales Support and asked about the 10 user license version, they recommended we get the unlimited user version ($270 more) because only 10 people at a time would be able to get in from OR OUT TO the internet.  If we keep the Smoothwall firewall and keep it as the default gateway and just use the Cisco for VPN access would this allow more than 10 at a time to access the internet?  While a limit of 10 at a time getting into the network from outside is fine, it would cause definite problems if only 10 at a time could get out to the internet.