First off, you'll have to use a mATX motherboard. I see from your sig that you do. Next, how many drives do you have? Most mATX "tower" cases can handle two hard drives and two optical drives plus use standard ATX power supplies. OF course extra HDDs may be added to FDD spots in some of them. The mATX "desktop" or "slim" cases can usually handle only one of each and don't have as good ventilation plus use mATX/SFX power supplies which may be limiting. All of the mATX case ventilation can be improved by cutting out fan grills and some can be improved by trimming the front face in certain spots. Generally speaking the included PSUs are not that great but that can be said about most cases of any form factor under $100.
Evercase seems pretty nice. Has rubber grommets for HDD mounting, but only two dedicated HDD bays.
Foxconn has 4 HDD bays, but construction may not be as good.
Athenatech has potential with a minor mod, by cutting out the rear fan grill and using a wire finger guard. This case actually has decent vent holes in the front face. Couple of drawbacks are two dedicated HDD mounts, the construction is kind of flimsy and the case is really short front-to-back so you have limited space between the optical drives and PSU. I've used quite a few of these cases and despite the drawbacks still like them.
InWin makes a bulletproof case - this one uses probably thicker steel than almost any other mATX case and you really feel it in the weight. I've build one using it and it has awesome airflow. Unfortunately it only has one dedicated HDD slot and was really cramped to work with. Still, made for a totally awesome system (I used a second HDD in the bottom FDD bay).
Apex cases are nice except only one HDD spot. They market a few different designs with the same chassis and some are also marketed under Foxconn name but with the same chassis (different than the linked Foxconn above). I've used a number of these and they have good airflow and nice, strong construction. Think of it as a notch below the InWin but still better than most. The drives are absurdly easy to install in this system. Another drawback with the one HDD spot is that it is mounted sideways, no problem for EIDE but SATA cables need to make a tight 90º bend right off the drive. I've done it, but didn't like to. You can buy 90º angle SATA cables, but that's added cost. The included fan is noisy. The very last system I built using one of these chassis had one optical drive, one floppy drive and
SEVEN hard drives!!! How did I get that many in there with only one HDD spot? BWAHAHAHAHA!!! Think about it for a while... I need to see if I can dig up the pictures... After you think about it, LMK and I'll tell you how I did it (and post pics if I can find them).
Cooler Master is my current top choice for a mATX case because it looks well built and elegant - never used one but am trying to, ahem, justify buying one.
Looks like decent ventilation but you need to use many fans. Only two HDD spots. One limitation may be that the motherboard is "upside down" to the power supply, meaning the motherboard power cables have to stretch all the way across the motherboard - if they even reach.