Looks good. Should be a very nice system, though I would give this cooler a look. I also suggest going for this thermal material.
The MSI is a good board and worth considering (very positive review here), but there is a reason for the price premium of the P6T: it is full ATX (vs micro-ATX of the MSI) so there are more expansion ports (PCI/PCIE) and it supports SLI and crossfire ( the MSI only supports crossfire).
Id check the clearance over the ram slots on the p6t board, im using a TRUE black on my dlx, but the megahelims is a lot wider than the TRUE, it may cover the ram slots once you add a fan to the cooler.