Additionally, what you want in years to come might not even be the same thing that you want now. Two years ago, I sure couldn't predict what I'd like my machines to be able to handle today. "What? A web server? Whyever would I need that?"
When it comes to hardware, buy what you need right now and no more. Let future-you worry about himself.
Unrelated tangent: why is this text area so small, anyway?
I understand not wanting the hassle of buying a new drive at some point in the future, but I've a hunch that this is the sort of "future proofing" that makes your system seem charmingly quaint a year from now.
But you're wildly overengineering for your needs; you could literally spend half as much on a system which isn't "future proof", and in two years replace the entire thing for half again what you paid. So my question, which seems to be the common one, remains, why?
(b) This box's destiny is to go sit in a room quietly and just work. Any time I spend on it after it's in that quiet room is time wasted, and I'm willing to spend a bit more (though not a huge amount more) now to save a lot more then. If I was a postgrad again and my time was low-cost and I wasn't hosting data I really worried about, sure, I'd pick the newest, shiniest toy and try to make it work and if it didn't, oh well, I learnt something; but that's not the case here, I just want a solid box I never have to worry about no matter what else we throw at it. This ain't the project car in the garage being endlessly worked on for fun, this is the family estate wagon that's used for the shopping and getting the kids to school, if that analogy makes any sense.