I take the dual-core processor, as that is an important part for all computers. They will be needed for servers and gamers will need one for the best framerates. Then, they will also end up at your local Best Buy.
Also, more 64 bit operating systems will be needed for the 64-bit computers out there.
Dual graphics cards are pretty neat, but very pricey. I think it will take a couple years before this will get enough use.
And right now most people don't need larger hard drives. For most people 2 200GB HDs is large enough. What is needed is faster HDs. I like the SATA II offerings from Seagate. They are pretty fast and you don't get the ribbon cables that ATA HDs have.