Jenny has some very good suggestions. The tablet you first point to is one with Windows RT. It does not support legacy applications as it does not have a desktop app like the full Windows 8 has. If you want a Surface, Windows released the Surface tablet with the full Windows 8 on it a couple of months ago. Windows Surface Pro
As you can see, it's pretty pricey.
If you are interested in the full Windows 8 tablets that can also be used with a keyboard, you can go to a website like Newegg and sort them out and do some reading, especially what the users think of them. Of course, then you'll have to find out what is available in your part of the world!