That's a very helpful thread, thank you for the link!
Ignore everything and just go by motherboard comparisons. Tom's Hardware has two X58 motherboard comparisons you can look at.
1.) All these boards support the same processors
2.) All these boards support the same memory speeds
3.) Core i7 retail samples support DDR3-1066, DDR3-1333, DDR3-1600, and DDR3-1866. The motherboards also allow you to select DDR3-2133, but it won't work with most processors (memory controller issue) or RAM.