[Guide] NAS Killer 4.0 - fast, quiet, power efficient, and flexible - starting at $125

Are the Rosewill 4U cases compatible with a Micro ATX motherboard? I want IPMI, so the X9SCM is the only option of the ones on the list.

Also as an EU buyer the prices are going to be higher overall generally, but after soom looking around, I see that the parts (new) are 2-10x the price listed here.

Is buying used off ebay really recommended? (I’m a noob around here) Any ebay buying tips?