Cigarnut is right on the money. Buy a used desktop, don't bother spending 200-300 bucks on something you'll outgrow in a year.
The price difference between buying a box and singles will soon have you loading up on boxes. That's when you invest in a large cooler and some beads and you'll be set for a while..............until you need another cooler and more beads.............then after that you'll need another cooler and some more beads.
There's a reason it's called a slope