The only difference seems to be in the colour. My friend is using a similar G.Skill kit (PI) and he absolutely love's it in his EX58-UD3R Rev 1.6. Since you aren't using a multi-gpu setup at the moment in the new build I would suggest the following:
i7 920 D0 stepping
Gigabyte EX58-UD3R Revision 1.6
Samsung Spin Point F3 1TB or Seagate Barracuda 7200.12 500/750Gb
Sapphire Radeon HD 5850/5870
As you might have noticed it is similar to what you already had listed but with a few minor additions/modifications.
I'll check out those hd suggestions you made, thanks