I'm not quite sure I understand the math on this one either.
But to answer the question - the PSU wattage is fine but Thermaltake makes garbage PSUs, you're better off going with Corsair or Seasonic.
The H61 will not be able to overclock as you forfeit access to the RAM multiplier among tons of expansion options (SATA ports, PCI slots, RAM slots). You want an H77 or Z68 motherboard if you're going to be using a 2500K, and get a full ATX board, I never advise anyone to go with an mATX board on a full tower system.
All very good answers, thanks, but about the psu, its enough watt right? Also, I need a reliable but cheap motherboard, I like the Asus motherboards but its so expensive. I don't really need to Crossfire but I need a graphics card. My PC is a gaming one.