meh budget is anything under $160US, definately want something cheaper, but if its worth the money then yah.
You can check out the
Antec Aria. This is the case I am using for my HTPC to basically record TV programs and watch movies and limited gameplay on this PC; my primary rig is for gaming. It is a pretty small case but large enough to fit any m-ATX mobo. It's a bit cramp but can fit 3 hard drives and 1 DVD drive. There is no 3.5" floppy drive bay so you'll need a usb floppy drive if you need to use floppies. Personally, I haven't had the need to use a floppy disk in over 4 years. But it come with a proprietary 300w PSU which may be too weak for you if you want to build a gaming rig.
Another case (newer) is the
Antec NSK2400. It has a 380w PSU, but it can be replaced by a standard ATX PSU if you need more power. The case is quiet large for an m-ATX case though. The good thing about this case is that there are 2 120mm fans on the side to exhaust hot air.
A new stylish that has been recently released is the
Aopen G325. The unusual thing about this case is that the PSU is placed in the back outside of the case. The only fan to exhaust hot air is the PSU fan so it's not wise to have a hot running CPU or GPU inside the case.
Here's a review in case you are interested.
If you are okay with a micro tower then consider the
Cooler Master RC-541. Go to
Newegg.com for more images. The front is a mesh design to allow plenty of airflow and there are removable and washable dust filters. It comes with a 380 PSU, but unless it's a case and PSU combo made by Antec or Silverstone, I wouldn't trust it.