A.) I wouldn't go with AMD and those PSUs at all.
B.) There are better builds though $/W should not be considered as per original requirements.
C.) Dual channel memory and cas rating is important in terms of bandwidth and speed which is not benchmarked for.
D.) SSD > HDD on avg, and have better warranties in terms of all components.
E.) 2day shipping should count.
F.) Please see the AMD benchmarks in single channel.