Which of these refurbished Dells is the best deal??

[DJboutit]

I currently have a Dell Precision T3500 Intel Xeon W3550 cpu 8gb DDR3 ram I am looking for upgrade for under $340. I am not a high end gamer and I do not need really high end specs I just need a computer that is a decent upgrade from what I am using currently??

$300 or under

https://www.newegg.com/Product/Product.aspx?Item=9SIA6YC3JZ1734

https://www.newegg.com/Product/Product.aspx?Item=9SIA6YC3JZ1657

$340 or under

https://www.newegg.com/Product/Product.aspx?Item=9SIA6YC3T59433

https://www.newegg.com/Product/Product.aspx?Item=9SIA6YC44T0267

https://www.newegg.com/Product/Product.aspx?Item=9SIA6YC3T55265

https://www.newegg.com/Product/Product.aspx?Item=9SIA6YC44T0291

Which 1 one computer from each price range is the best deal?? Is there much of a difference from have 12gb ram vs 16gb ram??