I'm selling my Mid 2010 Mac Mini. It's in very good condition, without any issues. Its has a clean install of Mountain Lion, and the ram has been upgraded to 8 gb. This is the last model that has the Superdrive DVD/CD burner.
Here's some specs.
Intel Core 2 duo 2.4 ghz processor - 64 bit
1066 bus speed
Firewire 800 port
8 gb ddr3 memory
320 gb hard drive
NVIDIA GeForce GT 320M graphics chip w/ display port & HDMI
Looking for $400 shipped.