You can secure it, and the article is correct, not all routers/clients make WPA secure. The big thing to watch out for in WPA approved hardware is an AES engine in hardware. The WPA spec calls for AES to be used only if hardware exists, otherwise TKIP will be used. TKIP is a better key exchange protocol, but it still uses the RC4 encryption stream from the WEP engine (read, RC4 = security hazard).
Using AES with your WPA hardware, and having AES/WPA hardware for every node of your wireless network is the first step. Next, pick a good AES key, turn off SSID broadcasting, filter by known MAC addresses only, and limit your power output to the network size you intend to use, amoung other security enhancements. wjsulliv is right, you'll never be secure, but you can do a good job as keeping the common hacker out of your network.