I need to find a budget case, which has good airflow (for heavy OC), front usb3.0 ports, and as small as possible(least important).
Budget around US$50-65
These are the components:
CPU: Core i5-2500k
Motherboard: Asus P8Z68-V Pro
Memory: G.Skill Ripjaws X (2x4Gb)
boot drive: Crucial m4 128GB 2.5"
storage: WD Caviar Green sata2 500GB 3.5"
Optical drive: ASUS DRW-24B1ST
cpu heatsink: Thermalright Silver Arrow
(I would like to have the space to add up to two gpus in the future.)
There are very few cases with usb 3 and on top of that, there are not many cases at 50-$65 that are good quality and good airflow. There are only 2 cases that I found within that price, the nzxt source 210 elite and the thermaltake a60. Now I don't know anything about these cases and I've spoon fed you enough, so you look for reviews. Not trying to be mean.
Also if I were to spend that much money on a rig, I wouldn't cheap out on anything.