I was thinking the vanilla P5Q would be a good choice for you, but I see it's come up in price.
Looks good. What power supply are you using?
Get any Western Digital HD with the letters AAKS in the part number. All good deals.
The WD7500AAKS and especially the WD6400AAKS are excellent. The WD5000AAKS is best avoided, no PMR, less speed.
MB: P5Q Pro - it has PCI-E 2.0 and Crossfire, a lot more future-proof than the P5K.