Not really. It would not be the optimal balance for that build, but it wouldn't be a waste.
Personally I would go for something in the 650W-750W range for that build. That should be just over double what the rig would draw at max load.
Ideally, you want your PSU to run at around 50% most of the time. That is where the majority of PSU's are most efficient and it also tends to be around the 50% mark that they start making noise. Keeping them just under that, will give you the most efficient PSU with minimal noise.
That being said, he could get away with less than 650W-750W, but going a bit over allows for future upgrades and/or OC, while still keeping the PSU in it's performance sweet spot.