that's pretty much all u can do with ur current hardware. the question is, how secure is secure? even thousands of dollars' solution has security holes.

if u r looking for test for the security from the internet. go to www.grc.com and try their shieldsup test.

in ur router configuration, make sure u enable the security log and u can monitor from there. also, if ur router is giving out IP addresses, u should be able to check the DHCP tables and see if there is any MAC addresses that u dont recongize.

Albert