There are a few sites that deal with single-board computer news like:
http://armdevices.net
http://liliputing.com
http://linuxgizmos.com
Quickly, you might take a look at the ODROID boards, they nicely cover the lower price and performance spectrum and do a nice job supporting them: http://www.hardkernel.com/main/main.php
For example, if I'm looking for something more powerful than a Raspberry Pi / Arduino / Beagle, etc. but not quite the level of an i3, where would I look?