+1 to the ESD Strap.
Well worth the $6 I paid for it at Radio Shack.
Out of the 2 board you linked to I tend to like the ASRock a little better.
Mainly for this:
"On the board itself we get integrated water cooling on the large VRM heatsink (like the ASUS Maximus V Formula), a liberal abuse of eight fan headers, 10 SATA ports (six SATA 6 Gbps), 8 USB 3.0 ports with 10 USB 2.0 ports for good measure, an ideal layout for dual-GPU setups, all the debug tools needed should anything go wrong, 13 (thirteen) onboard temperature sensors and even voltage read points for overclockers. Features not readily apparent include a multiple filter cap system to reduce electrical noise, and switches to enable/disable PCIe slots (reduce instability when not in use)."
The 6 SATA-6Gbps is nice. With SSD's and HDD's all offering 6Gbps now it's nice to have the ports to actually make use of the speed.
My board also came with the optional USB 3 front panel plate. I find it very convenient for connecting my external HD that is also USB 3.0.
As I mentioned to you before be sure that the board you get has ample headers for system fans, USB and SATA ports and whatever else you think you may need. I needed one more USB 2 header and fortunately found a cheap work-around.
And since you will be gaming too you will most likely be running at least one video card. These tend to put off some heat so the 8 sys fan headers will come in handy.
Just be sure to get a case that can accommodate more than 2 fans. Since heat rises it's a good idea to have the option to have a fan ventilate out the top of the case.
My case has a 120mm front fan - intake, a 140mm top fan - exhaust and the back fan location is used for my cpu cooler radiator that is sucking cool air in from outside. So I have cool air coming in from bottom front, mid back and hot air venting out center top.
I know this is more than what you've asked but I found that during my build all these things tie into MB purchase. I returned my first case because as I started to mentally put things together I found my case didn't have adequate ventilation.
Mike