Myth Tv

How does this sound as a build for a dvr?(I aplogize for not having all parts yet) Pentium g3258 Micro ATX motherboard(will update to model once chosen) 4-8gb ram (probaly 4 to start) PSU(have 300 watt unsure if it will fit or I will need a smaller one) 1-2 tb hdd. Either a wd or seagate(can't...