ASUS makes a pretty handy Chromebox, and it's handy not just because it's running ChromeOS, it's handy because of everything you can do to the box itself.
The ASUS Chromebox is easily upgradeable, and capable of running just about any linux distribution.
The model I picked up, the M004U has the following specs:
- Celeron 2955U (1.4GHz) 64 bit Dual core processor with 2MB L3 Cache
- 2GB DDR3 1600 RAM with 2 slots
- 16GB SSD HDD
- 802.11 b/g/n dual-band wireless, Bluetooth 4.0, and gigabit ethernet