I hope someone will have something for you but in case they don't, it's not hard to make one of your own. You will need:
a. VMWare or VBox
b. A windows installation
c. VPN software
c. Any browser(s) you like.
Make a new VM, install windows (preferably 7 as all you need is secure net so a lightweight os is better ), the VPN and a browser. Take a snapshot of the VM before you use it. You can change the user agent which shows how the browser will appear on web sites and there you have it. All the above can be found on this site by using search.
Every time you start your VM, use the snapshot to reset it and it will be like a new PC every day (no cookies etc), use the VPN to have different IPs and change the user agent to whatever browser you want to appear as using. Since its a VM you don't have to worry about viruses etc since snapshot will take care of them and your main PC will never get affected.
Hope it helped