Really Really Powerful Inbound Protection

best security firewall i used till date is ofcourse astaro security gateway its more than a home user can imagine for its been many time compare to cisco juniper etc

https://www.wilderssecurity.com/showthread.php?t=265959

https://www.wilderssecurity.com/showthread.php?t=260106

also demo

http://demo05.astaro.com/

 

As others have mentioned, a good SPI NAT router should take care of your inbound traffic. If you are looking to monitor the internet interface in detail, get one with external logging capability and throw in a free copy of Wall Watcher so you can make any reports/sorts you like. I used an old Linksys wrt54g for the attachments.