lga 1155 h61

Hi I have an atx mid tower case . I have no idea what brand it is . I found that there is no standoff inside my case I want to know what standoff should I install in order to install my motherboard I found a lot of sizes but I don't know which one to put Motherboard : ASUS H61M-E LGA 1155...

I currently using prebuilt wearnes 8610L with i5 3470 processor, H61 chipset LGA 1155. Now I'm interested upgrade to xeon e3 1270 v2, which is same perfomance to i7 3770 but cheaper. There is no information on manufacturer site if this supports this xeon. From the few that I read, it must update...