are micro atxs lower quality or more likely to break? or are they just smaller?
Depends on the manufacturer. The new Corsair Obsidian 350D is an awesome m-atx case, full of quality, but its a bit pricy. Another good m-atx case is the NZXT Vulcan, looks awesome decent quality. Other than that, you CM Storm Scout is a good choice too
I like the Corsair 200R for a decent built case that doesn't break the bank, but I prefer full size ATX mobo's unless you have specific needs.