Head over to the 1800x/1700x/1700 Owner's thread and read through it a bit. Most of them over there have more of a variety of boards. That Asus board does have 6 Phase, and should be plenty for the chip.
The differences in the MB's really comes down to memory support and feature sets.
I've never dealt with Asus, but I've read both good and bad things about them....as with any mfg. really. If he's not going to OC at all, and wants to save a little bit on $$, maybe one of the Gigabyte B350's might be a good option, and spring for a little better memory. Memory seems to big the biggest issues for a lot of the boards atm. I'm sure in time, all the mfgs. will have these issues resolved with bios updates, and updates from AMD as well.
Take a little time...and do some in-depth research. As I said, head over to the "big chips" thread and ask a few questions. There are some users over there that really know there stuff a bit better. chew* is one that has tested just about everything I think.
Also over on http://www.anandtech.com/
, The Stilt is another one who really knows the in's and out's of these chips.
Hope this helps ya little bit.