Although I agree with many of the rules, some of it is overkill. For example:
WEP is highly insecure, so WAP is a good alternative. As long as your devices support it. Many older computers and laptops still only support WEP, so you may be forced to turn down your level of encryption.
Although it can be an easy break for a cracker if they can find your computers, you can enable DHCP safely. One way is not to use the default IP address ranges that your router is preconfigured with. Another (and far better way) is to use Static DHCP. It's as secure as self-assigned IP addresses, and it's easier to maintain when it's all in one central place.
This will work on most days, but what happens when you get some interference, maybe due to some bad weather? Then your network goes down. It's a good idea not to put on way more strength than you need, but putting down the bare minimum is NOT a good idea.