I recently helped my father build a PC. For the mid-range CPUs the AMD processors seemed to be faster for the price but were less power efficient (and consequently run hotter and produce more heat). We did end up choosing the AMD though.
Unless you're running a high end stereo system you probably don't need a sound card. What is built into the motherboard is usually sufficient and a lot of them are 5.1 and 7.1 output now.
ATX is more or less the standard or normal size. Mid tower size is the typical size you'll see on full computer systems from Dell, HP etc.
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