I think the IBorad Pro is very suit for the home automation project like this : )
http://imall.iteadstudio.com/development-platform/arduino/arduino-compatible-mainboard/iboard-pro.html
The board is ATMega2560 + W5100, with SD and XBee socket, many interface breakout for sensor module and display. RTC onboard, and comes with Arduino MEGA 2560 bootloader.