Can I get some help choosing the RAM for my motherboard (M4A88TD-V EVO/USB3)?

Your motherboard can handle up to 2000MHz DDR3. Even in the specs listed on the site it says this. That's a socket AM3 / 880G chipset board, so it can handle the RAM you got just fine. In the BIOS for that board, you will have memory profiles to choose from: 1066MHz / 1333MHz / 1600MHz, and 1866MHz. So, no need to return that G.Skill 1600MHz set. You simply enter BIOS and manually set it to 1600MHz on 1.50v. Even if a motherboard doesn't support a higher memory frequency, it naturally runs the RAM at a lower speed by default. You are wasting your time returning the RAM you got. Again, not only does it support it, but even if it didn't it would automatically run it at 1333MHz by default on its own.