For what purpose? For privacy concerns? Generally proxies won't help too much..though they will help obfuscate somewhat. I generally had too many slowdown issues with proxies, so I use a VPN if/when I want to be secured on the internet. $40/year for the one I use - PrivateInternetAccess.
Also, quite a few websites can detect if you're using a known proxy and will sometimes not allow you to browse the site if using a proxy. Some forums will ban you.