Spec me 2 servers

[Turtles]

I'm looking for 2 servers with the minimum requirements:
1Ghz processor, 512MB RAM, network interface card capable of 100megabits per second, 500 GB of backing storage - expandable to 1 TB.

Cheaper the better! Is there any particular brands/models I should have a look at? Any help much appreciated.

 

[Turtles]

It's just for a home network, backing up data.

 

[Turtles]

It's for a computing project, I just need to find two servers with those minimum requirements and compare them. I had a google but I don't know enough about servers to be able to find what I'm looking for - hence why I asked you guys for some advice...