I think he went with microATX because of possible size constraints.
Midtower are somewhat easier to build and modify simply because they are larger.
In scanning his specs, his very high and high were the same board and processor for the two categories, thus will have similar performance.
The ITX machines are even smaller but will take a bit of a performance hit.
All appear to be nice machines. Depends on how much you want to spend. Easier if it is gov'ment money, or if you are independently wealthy (yeah, right.)
Motherboard doesn't really affect performance unless you are overclocking. The reason I went with same was due to the Q67 Chipset which supports Intel vPro. This allows for easy deployment, streamlined management, and high reliability. The
main only difference between the High and the Very High is the processor. The Very High has the 2600 while the High has the 2400. The difference between these processors is hyper-threading (4 Physical, 8 Logical vs. 4 Physical, 4 Logical, respectively). There is a negligible difference in clock speed as well. The benefits are only seen in highly threaded applications like video encoding. No benefit is to be expected in office tasks. But then again, you do get bragging rights.
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