Assuming that you meant to say UD3P-B3 motherboard, I'd suggest moving up in Gigabyte's line for two reasons:
1) 4P and above P67 boards have a 8x PCIe slot 2 that will allow a 3rd party RAID card to run fast if you ever consider upgrading to one - as evidenced by the PPBM5 benchmark, big RAIDs do really help Premiere Pro.
2) Your overclock target seems achievable, but not "trivial"; Gigabyte puts more and more VRM filters in their boards as you move up in their line which help to make power more reliable, particularly when you are overclocking. Specs. are UD3P and UD4 - 12 phase power, UD5 - 20 phase, and UD7 - 24 phase power. Based on G. Skill's site (I know you are not using G. Skill) they certify their 1600MHz RAM populated to 16GB for the UD5 and UD7 boards, but not any of the lesser boards. Bottom line, try to find a UD5 board (seem to be hard to find, but if it were me I'd wait). I did a quick Google and did confirm that 16GB users are not often getting their 2600Ks up to your target speed.
I don't know how you feel about fan noise (I hate it), but I went with Corsair's 1200 watt P/S which is overkill for my system, but dead silent because even with a 4.3GHz OC'd 950, 24GB of RAM, and 13 drives its 120mm fan always spins at is low speed.
Regarding your case, I actually have a 932 Black Editon (closed side), but would suggest you go with the HAF-X - it is a better case and comes with a full complement of fans. The HAF-X was out when I bought by 932 Black, but the cabinet where my system goes could not stand for the slightly taller HAF-X case.