Bump... now I am the one buying and building a new computer.

I am finally investing in a new system after like 6 years, and I could really use some advice regarding some aspects. I have tried to implement the advice you have already given in this thread, but working on my own will only get me so far. The prices are somewhat approximate, but electronics do cost a shitload here in sweden. Also if you have some general advice I'd be happy to take it.

CPU: Is it worth buying an Athlon 64 x2 in this day and age? The processors I'm looking at are.
AMD Athlon 64 X2 3800+ 2.0GHz Socket 939 1MB, BOXED - $400
AMD Athlon 64 3200+ 2.0GHz Socket 939, 512KB, BOXED - $200

Graphic: I don't know really about this card, maybe it's a overkill for me. I'm guessing that SLi is pretty good to have and that pci-e is much better than agp. If you have some tip on a good cheap card please tell me.
XFX GeForce 6800GS 256MB GDDR3 XXX, PCI-Express, 485Mhz/1.1GHz, Retail - $290

Motherboard: Don't have much to say about this, this one looked good.
ABIT KN8-SLI,nForce4 SLI, Socket-939, ATX, 4xSATAII, GbLAN, Firewire, PCI-Ex16 - $150

HDD: Just wondering if it makes alot of difference wether you have 8mb or 16mb cache on a SATA-2 drive.

Ram: Do I need 2gb ram or will I manage with 1gb?

Display: I'm going for a 19" crt for $180 mostly because I hate flat-screens, since they have shitty image quality and you can't configure the resolution anyway you want.