I expect the Linksys line to undergo some changes as they are now owned by Cisco.
http://newsroom.cisco.com/dlls/hd_032003.html Most SOHO firewalls do considerably more than just NAT, most have packet filtering ability and some limited statefull inspection. As has been said more than once in this thread for home use where you are doing nothing more than protecting your connection to the Internet most SOHO firewall/routers will work. I wouldn't put up my own web or mail server behind one without getting a real statefull firewall. Oh and never forget up-to-date virus protection.