It is said that
Wireless Security is an oxymoron. In other words, you can never be 100% secure with wireless.
However, you can tighten things down enough that the chance of you getting hacked is virtually nil. I'm sure that the FBI could find a way, if it was important to them, but I doubt you are that suspected.
So do what you can. Block all mac addresses not in your white list, use WPA-2 encryptions, don't broadcast your SSID, but most importantly, if you see a black van by the side of the road near your house, shut down your internet connection.
I like the black van part. lol :)
I also limited my ip address range to the two devices in the network.
range 192.168.1.64 (being PS3)- 192.168.1.65 (being my PC). Some people might rip on this suggestion, but in my case, with use on LAN limited to pretty much myself, it works well for me, no probs. I will be adding X-Box 360 soon, and just have to allow one more ip allocation ie. 192.168.1.64 to 192.168.1.66
I have dhcp enabled, but have port forwarding setup for a sharing program on the PC and ports forwarded for voice chat and various PS3 required functions, with no worries of ip wandering, AS LONG as I turn the devices on in the proper order, but seeing my PC stays on nearly 24/7 it never loses it's assigned ip and the PS3 automatically takes the only other one available. It has been a few months now and I have not had to mess with my router, or other setting due to ip's not matching, and ports getting screwed up.
This is in a wired setup, but this might be another way to tighten up your security on the wifi as well. If you have many people logging in and out, and need a wider ip range to allow more ip's to be dished out, this might not be for you.
Just a thought, something that is working for me.
Tell me to butt out if I missed the mark here.....lol