In my opinion Haf 922 is better then the Antec 900. I own the Haf 922, and I find the Antec 900 to be far too hyped for a case.
List of positive things with Haf 922:
* Prices are dropping, I picked mine up new for $89.99 with $20 MIR. Antec 900 is going for clear over $100+ and no mail in rebates at the moment.
* Tool less drive bays/hard drive bays. All use rubber padded lock in. Drive bays use small plastic/rubber inserts to lock the 5.25" bays in place.
* Motherboard tray has easy access to CPU bracket mounting back via hole in motherboard tray.
* Hard drives are slanted to the side facing opposite direction from main side panel (windowed panel) so cable management is easier. This also gives you far superior room for graphics cards or any thing else.
* On Board radiator Slot on the side giving quick access to GPU/CPU without heading into the way of cables.
* Water cooling pipe holes.
* All steel frame, plastic bezels in front for looks and swinging feet (no joke steel hurts even swinging your feet).
* Front mesh bezels are steel, and come with dust filters for each bay.
* Length of case helps with cable management since most cables can be hidden on the far right side, also the motherboard tray sits an inch or so off the other panel so sneaking cables is easy.
* 2x 200mm Fans, low noise, and 1x 120mm low noise fans. These fans are excellent, and quiet. They are better then the tri cool fans from Antec. I have tried a few of the Antecs at Fry's and I am afraid a cheap Dynex 120mm fan I got off a pallet beat them cold heartedly even at Antec's "high" setting.
* Side viewing panel has slot for a 200mm fan, or 2x 120mm fans. This is great for hot air rising as cooler air coming in will immediately force hot air to go up due to high/low pressure system. Upon which the 200m exhaust at the top will remove the hot air.
* Another 120mm fan can be mounted at the bottom as well for further cooling. An intake fan is also recommended here but a low performance once may be necessary if the side panel has been retrofitted with a 200m or 2x 120mm fans due to very high pressure inside the case. 200m in front has a red LED that is not too bright nor too dim.
* E-Sata availability in case you want to use an external hard drive at SATA II speeds.
* Dust filter covers the 200m intake fan in the front.
* 5x 5.25 bays. Comes with 1 bay ready for floppy disk drive and 2x 5.25" to 3.5" adapters are included. Each of the bays can access cd/dvd/bd trays or other input devices such as media readers.
* 5x Hard drive bays, rubber padded insert screws. (no screw driver required as the "screws" slide in) Feels cheap but really is good build material and highly recommended since it reduces vibrations.
* 7x Tool less expansion bays with knob turned screws. If you want you can use a philips flat head or cross shape driver for those paranoid individuals who want to make sure it's tight.
Antec 900 positive features:
* Prices are also dropping, $89.99 from Newegg as of 12/16/2009 with free shipping. I dont expect it to last much longer.
* Steel+plastic case.
* Water cooling pipes
* 2x 120mm blue led fans,1x 120mm fan and 1x 200m fan. The tri-cooling fans kinda suck to be honest. The 200mm is known to be brittle as well. Other then that the cooling is great. LED’s are kinda cool I guess. The speed switches are definitely a plus, but even high settings are kinda lame to pay $14.99. A 120mm Dynex branded fan does a better job mostly because it was made by Zalman if I remember correctly.
* Huge display window to brag. Con or Pro is personal preference.
* Bays are limited to 3 5.25 and 1 3.25 for media burners or other input devices which require front side access. 6 3.5” Hard drive bays are provided.
* Comes with a place to put things in at the top of the case. I dont recommend any liquids or small objects going there as the fan is above it and a little deeper but still close enough for an accident to occur.
* Firewire connection for devices that use it like cameras, cam corders, and some apple branded stuff.