Nice, it's cool to know it can fit such a huge fan.
What else are you going to be doing to it, modding wise? Besides the paint job of course.
Also, kudos to the 720 pick. I own one, and on stock cooling, I got it to 3.888ghz on stock cooling with DDR2 800 PI Blacks, but it was pretty unstable. I keep mine at 3.5ghz 24/7, without better cooling, it gets too hot under full load. With a good after market HSF, like a Core Contact, you could at least keep it at 3.6, maybe 3.8 stable.