In regards to firewall for your network.
All routers by default are firewall, so you have firewall, but is it enough protection for your network ? You have to know what kind of specification you want on your router / firewall ?
If you are looking to get a economy SOHO router then best choice right now is Linksys RV082:
http://www.linksys.com/products/prod...id=29&prid=589
Cheers