Secure VPN Services

I've been looking recently at options for a secure VPN connection to the US or Europe. There are many websites which treat traffic from Australia differently to other countries, and it helps to be able to test sites from different locations. In particular, when using CloudFlare I'd like to be able to check if my website is up & running for users in America, not just the local Oceania area.

One of the best services I found was Super VPN Service. They offer VPNs for anonymous surfing with an IP address located in the United States or Germany. They include a torrent VPN service, and even a free account with the following features:

• Connection using PPTP&L2TP protocol.
• Servers are located in United States and Germany
• Unlimited amount of traffic
• High speed internet connection
• 128 bit encryption
• Works for PC on Windows /Linux/Mac OS
• Works for mobile phones with Android/Windows/Mobile/iPhone/Blackberry/Symbian platform

That's a pretty full featured service, and the free option sounds like it would do me fine. What VPN service do you use, and how much does it cost per month?