If you're not going to be overclocking then you do not need to buy a heatsink. So you could save ~$30 which could be put towards a faster CPU.
Your PSU and mobo choice seem to suggest that you want the option to crossfire at some point in the future. If this is not the case then you could save some money getting a mobo that doesn't have two PCI-E slots and by getting a 500W PSU. If you're interested in this and want suggestions then just say and I or someone else will likely come up with something.
I just always use a non stock heatsink in anything i build outta habit. I don't plan on overclocking it atm or going crossfire right away but i like to keep the options open for on down the line in a few years time. Othewise it seems like a solid build? It's actaully for my neighbor but i'd be the one taking care of it. I own an i7 build myself.