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For your needs? 128 SSD and 4Gb RAM is plenty. You won't be able to tell the difference with your i7 while browsing the web or even edit photo's. You're not going to install applications that will use a ton of storage and you will be set for years with the cheapest machine.
256GB SSD and 8 GB RAM is nice, go for it if you can, but not necessary. And an i7 is simply overkill to the fullest.
Save the dollars and buy a 1 TB external, or even a 500GB, which is also fine for your use.
 
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