You could definitely save some cash on your motherboard. Here's a family of P8Z68 motherboards that you could pick from. I got the $205 one, however, you could go even lower than that if there aren't any specific features you are after and save a decent amount of money.
For memory you don't really need more than 8GB so you could save some money there as well. If you really wanted 16GB you could certainly do it, however, I would recommend some 1600.. something like this..
I chose this for my PC because it was low profile which is what I was looking for.. some people are looking for aesthetic appeal and aim for heat sinked memory.. in that case these are popular and a bit cheaper..