As for a platform, you will be going with the Intel Sandy Bridge LGA 1155 platform. This will be the most power setup for the first quarter of 2011 until the LGA 2011 socket's release (I don't think the Bulldozer will compete with them outside of price to performance).
As for GPU, it is a wait and see what is out at your time of purchase.
Hard Drive: I would look at the new Intel SSD, which should be out by January.
The rest is still pretty standard and shouldn't see much of a change from now... IMO