If it is a quality PSU, you'll be able to run any 1155 CPU/board combination you desire. Your two biggest power drawing devices in the computer are the CPU (at up to 125W) and your graphics card (up to 300W) almost everything else inside is 2W to 25W. Under normal operating conditions, most people do not fully load their computer so even while gaming (or other demanding operation) your components will not be working near 100%.
Just for an idea of power usage, my gaming rig: Core i5 2500k overclocked, Maximus IV motherboard, 16GB ram, three hard drives, one optical drive, five fans, water pump and HD7950 overclocked - my power draw at 100% load? ~365W
BTW, your PSU will work best at about 25-75% it's rated wattage (my numbers, generally speaking).