Any of those configurations would work. Any computer store can help you.
Hell, a Core i3 (or even a Pentium) would be sufficient if this is all you would be using it for...
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If you are planning to get a laptop any of those configurations are ok as Al Hill says, however, what you’re using the system for, you can also use less than that as N. Scott Pearson mentions.
From my point of view, I would recommend buying new technology because you never know what you will be using the system for in the future.
You can take a look at the new components here: