Raspberry Pi 2

It's small, it's cheap, it's easy as Pi ...

Except for a small problem with wifi config:

$ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

network={
ssid="YOUR_NETWORK_NAME"
psk="YOUR_NETWORK_PASSWORD"
proto=RSN
key_mgmt=WPA-PSK
pairwise=CCMP
auth_alg=OPEN
}