Your choice is excellent
"Video card: One of the top NVIDIA ones (undecided)"
The 8800GTX should last you a while, but like others have mentioned, it may be worth waiting until Viesta arrives, and so, Direct X 10 featured games along with it, to test the card out, as this is what it was built for. To be the first card to support it.
The 8800GTS is also a nice starting point to this and is slightly lower in spec, yet I don't think its out quite yet.
You could be in two minds about these cards for that reason. They'll be fantastic for Direct X 9 games, yet, won't be able to do much more yet, and so, is a very expensive price to pay for something you can't take full advantage of.
You could though, buy a decent 7 series Nvidia card that'll play the games you'll want to play for a while, and then get a 8 series card when more come out, and so the prices will drop to more manageable amounts.
On a recent CustomPC review, these monitors came out on top:
"NEC MultiSync 20WGX2" acheving a Approved Rating, and the "Belinea 10 20 35W" achieving a Premium grade.
Well, since the Intel Core 2 DUO runs rather cool, a good old Arctic Cooling Freezer 7 should do wonders
If your going to game, a Sound Blaster X-FI will be the perfect choice. It also offers superior MP3 playback quality (Havent tested that myself)