allow websites

hi, I want to buy a new firewall. But i have some questions. In the office we have only one pc and we want to block all web sites and allow to just (exp) http://forum.mikrotik.com/ and http://www.accuweather.com/
i found it this model RB951Ui-2HnD and this model RB951G-2HnD which one is suitable for me and how can i solve this problem.
thanks for everything

nobody doesn’t know realy ?

You can use transparent proxy and then make access lists for HTTP webpages.

For HTTPS pages you can only block with Firewall based on IP addresses. You will have to know which IP addresses to allow and block all others.

Either unit will work, one has Gigabit Ports + POE Out, were the other only has Fast Ethernet.

HTTP you can solve with transparent proxy. But https is more pain in the ass. How many web pages would you allow 5, 10, 50 and are those web pages HTTP or https?