Get a board with the most SATA3 ports. AFAIK, only ASRock and ASUS makes a mini-ITX/Micro-ATX with 8 or more SATA3 ports built-in (anything more than 6 will have a third party controller builtin).
I use newegg's power search feature to start.
Power Supply is also important, get a fanless one, like SeaSonic's X series, with about twice the amount of combined power your current config offers.
I settled with ASUS Maximus VI Gene (cheaper than the latest VII Gene, and comes with the mPCIe combo card), Fractal's Define Mini case, Seasonix X 460W 80+ gold fanless PSU, a good, quiet CPU cooler, and the cheapest Intel CPU I can get my hands on.