Just a couple of things that spring to mind:
-The A8N-SLI Deluxe will need a northbridge heatsink (will it interfere with the card?)
-Maxtor HD's are louder than the Samsung equivalent
-Geforce 7900GTX will be needing an aftermarket HSF
-NEC DVD is noisy, if that bothers you (LG, Plextor and Samsung seem to have the reputation of being less noisy)
Don't know about the rest, but it sounds like noisy stuff to me
I think you will find out like many first time builders (myself included), that noise quickly becomes an issue, then you will come back to these forums and ask what to do, and you'll end up buying a new case, new psu, new heatsinks, new fans and all in all spending more money than you needed to.
Apart from that, I would stay away from generic memory.
I am looking to make a computer that is not outdated quickly
That doesn't exist
There are two strategies to this problem:
1) get a low-medium range computer that's upgradable and upgrade every year or two, right now this would mean going for AM2 or the upcoming conroe
2) get a medium-high range computer and redo the whole thing in four years or so, in this case I would suggest going for just below top of the line hardware, because the price/performance is much better (in any case that 7900GTX isn't going to be the top card anymore in a few months), so get a GT, and 2GB of ram is enough for most, etc...
Well in any case you would have a computer that works, but how well, how silent and for how much money is the question!!
