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I think the heatsinks are the same if I'm not mistaken.
I'm in the same boat as you. These are my current opinions:
The Deluxe has 16+2 VRM while the Pro has 12+2 VRM. The Deluxe also has 2 gigabit ethernet ports vs the 1 on the Pro (I don't think you need 2 though). The Deluxe has better heatsinks. The Deluxe has the 2 USB 3.0 ports on the front via the drive bay adapter. The Deluxe also has onboard reset and power on buttons and diagnostic LEDs.
Here's a chart that helps simplify most of it:
If the $50 price difference is justifiable by you then by all means go for the Deluxe vs the Pro. However, if you see no use in the extra bells and whistles then go for the Pro.
Thanks for the comparison chart. That was very helpful for me as well in making my decision on which P8P67 board to get.