Instead of spending 8K for Motherboard at a 25K budget PC, get ASUS F2A85-M @ 6.7K which is more than sufficient for all your needs. With that money, get a single 1600 MHz 8GB Module from Corsair (2.7K) or Kingston HyperX Blue (3.1K). I am suggesting you 8GB because the IGP of the CPU, HD 7660D is going to share Memory from the existing Ram and it can share up to 2.5GB of memory, resulting only 1.5GB of effective system Memory in full GPU load sometimes. So 8GB module is recommended.
Also my preference is Kingston HyperX Blue module over G-Skill or Corsair Vengeance because of the overclocking potential. As IGP is going to use the same memory, faster the memory, faster the GPU performance. Even with older Llano APU, A8-3870K, it has been observed that there is more than 33% performance improvement between 1866 MHz Ram and a 1066 MHz Ram. Kingston modules are known for their extreme overclocking potential and they can run at 1866 MHz speed with ease. In fact they can be pushed over 2000 MHz with good stability.