The EM-3 and EM-5 are two small ITX cases compatible with standard ATX power supplies, and full-size video cards. But the best feature is convection cooling with a profusion of air vents.
EM-3 specifications:
✓ 222 x 251.5 x 211 mm
✓ 4.5 mm thick aluminum panels
✓ 1 x 3.5" and 1 x 2.5" HDD or 3 x 2.5" HDD
✓ 1 x USB 3.0 and 1 x USB 2.0 (front)
✓ 2 x PCI slots
✓ Black / silver options
