When you have a really good build with expensive components like yours, the PSU is not the place you should look to in order to save a buck.
There is only one review I found for that model (though not wattage) PSU made by FSP:
http://www.techpowerup.com/reviews/Fractal_Design/Integra_R2_750W/11.html
Not the best rating. It's considered a good value though.
This power supply has among the best ratings I've seen and runs only $10 more:
http://pcpartpicker.com/part/seasonic-power-supply-s12ii520bronze
For a microATX build, I'd be even more inclined to seek a modular supply though:
http://pcpartpicker.com/part/seasonic-power-supply-m12ii520bronze
Again, it costs a little more, but for $80 you'll have a high quality PSU without any unnecessary cables obstructing the mATX airflow. Also, Seasonic produces top-quality PSUs.