Differences between H400 and the most popular H500 for those interested:
1. Form factor: 35L (mATX) vs. 39L (ATX)
2. Fan support: five (top 2 x 140 mm) vs. four (top 1 x 140 mm).
3. Double front side vents vs. Single front side vent
4. Full glass panel vs. 3/4 glass panel
5. 4 expansion slots vs. 7 expansion slots
6. 4 x 2.5/1x 3.5 storage vs. 3 x 2.5/3 x 3.5
7. 3x Aer F120 case version fans included vs. 2x
8. MSRP $110 vs $77.
H200 (MSRP $99) white is also on sale for 69.99.