This is just my opinion, but if what you are looking to accomplish is the protection of your information from the rest of the internet, then the best bet would be to get a hardware firewall put in place. While many basic wireless routers integrate a basic firewall, there are a couple better solutions that really step up the protection. First, a more business-oriented wireless router will have a stronger firewall system. The SMC Barricade ProMax N wireless router is one I've been using at several locations and I am really impressed with it. Very powerful and flexible, and it has a built in firewall with intrusion prevention. There are a LOT of security features and settings I don't even know about, but it's a great tool for having a firewall and costs around $110 including a built-in USB print or file sharing server, 4-port gigabit switch, 300Mb/s wireless transfer rate, and a rather long-range wireless coverage area.
If you want something better than that, I'd recommend the Sonicwall TZ100, which is a dedicated firewall appliance. It's cheap as far as dedicated firewalls and very easy to set up. You can also purchase a subscription package that adds a lot of features to the device, such as a real-time network continuous virus scanner, content filtering, intrusion prevention, and much more.
If what you're looking for, though, is just simply to hide your IP address then there are several ways to do so now without having to use a proxy server. I actually believe there is a web browser that will do it all for you. You have to download and install a small applet that runs as a service on your computer, but then you run the matching web browser, which sends all traffic through its own dedicated random loop of proxies to hide your IP address without having to program or set anything up.