Ike
The responsible thing to do is to impress upon your friend the importance of buying a quality Motherboard.
It is the base layer of all his future builds and is the one component that you can hold on to for longer than the rest of your stuff will take to become outdated.
Yes, it is tempting to spend as little as possible on a motherboard just to get something up and running, but what happens when his motherboard can't cope with some of the functions he will likely come to expect from his PC in 6 - 12 months time.
He would then be in the same position he is in now, ie, starting to save up for a cheap upgrade.
The issue with a cheap / bad motherboard is that there is nowhere to go from there except a total replacement and nothing to add on if the base layer of your machine cannot cope or even worse des not support the add on you are planning
My honest advice, have him rather spend the entire R1500 on a decent entry motherboard and then start saving for a CPU after that purchase.