photonboy :
8GB is plenty.
It is NOT true that you can "never have enough RAM". I have 16GB and my PC rarely goes above 3GB. I've never, ever used all 8GB except when video editing (most of 16GB).
People buying 16GB or more are just wasting their money if they don't need it.
I hate people with this mentality. Take me, back in 2009 I put together a rig, for one, at the time I asked forums about 512MB HD4890 vs 1GB. Most people would confidently say "512 MB is more than plenty dont waste your money".
well you can bet today, or even in 2011, i sure was glad I chose the 1GB version.
Same thing with RAM, I have 4GB DDR2 with a Q6600. I wish I had got 8GB back then when it was cheap. Now DDR2 is quite expensive because it's not produced anymore. Also since I did 4X1GB sticks, It's even harder to upgrade. 2x2GB sticks is 50-60 dollars, and that would only upgrade me to 6GB (2X2+2x1). So to do 8GB for me would cost over $100, definitely not worth it.
So if you're building a long lasting rig, buy plenty of RAM in every component. If you upgrade every 1-2 years, then you dont need to. If I was building a rig today I'd DEF do 16GB rather than 8GB.
Too be honest my rig shows you can build long lasting. I can still handle Metro Last Light at good setting with a 2009 rig. I find that impressive. Oh, you know the other dumb thing everybody told me in 2009? "Get a C2D you dont need 4 cores no games use them". Harumph, sure glad I dont listen to the masses who always want you to buy whatever they did (eg, everybody owned a C2D and a 512MB card back then, not my fault they were dumb).