I would suggest the Internet Security Suites type of security programs.

Most of those cover all that {wifi protection}so you don't have to worry.
I'm using the Zone Alarm one this year along with the Threatfire program that adds another layer of protection.

[ZoneAlarmŽ Internet Security Suite
Complete protection for your PC in a single, comprehensive program
Banish viruses, block spam, and remove spyware from your PC for good. ZoneAlarm Internet Security Suite not only eradicates threats but also prevents them from ever entering in the first place. Comprehensive protection defends your PC with robust firewall technology and stops identity thieves and spammers in a single, easy-to-use application.]http://www.zonealarm.com/store/content/catalog/products/zonealarm_internet_security_suite.jsp

I got Network Magic on my Dlink install cd, tried it a couple of times...
But we are out in the country so if anyone was trying to access our wifi they'd have to be in our driveway and the dogs would be barking LOL.
We tested our signal strength with the laptop outside, it doesn't go very far.

But in a town or city where others are right next door, that is something to be aware of.
As long as they can't get into your computers that is the main thing.