You could look at getting a single 8GB stick and then upgrading to the second stick later. Also, you could look at dropping to a Haswell Pentium to help save some money at the start.
Also, I'd personally just get the final power supply to begin with.
because it will be a hard sell, that i don't feel is worth the headache.
i have a friend who has a FX8320 and the amd equivalent of my 770. side by side our systems run nearly the same, my boot time is a hair faster. but honestly there is no noticeable benefit and no magic= not worth the headache of telling them to go amd on a $2000 investment when i went Intel with my investment.
the price point is $2000, they all know it, they just want the computers sooner so im looking for help on which corners to cut to give them something that will not have to be totally replaced to upgrade.
is overclocking an issue? otherwise you could offcourse look into the Xeon E3-1230V3 as an option. its a i7-4770 without the igpu, but its just a few bucks more then the i5 if im right. Offcourse for just gaming it does not matter much but for gaming and streaming, or some video editing and stuff it could make sense, those extra threads power.