I'm using the Kandalf (the same as the Armor) and it's pretty good. The inside is spacious and provides better ventilation. Although due to so many vents and it may not be as quite but it provide good cooling. Also you have the 250mm side panel fan upgrade that helps cool down the motherboard components.
TT Tai Chi would be real quiet, but thats because the case itself help acts as a heatsink. There is also a completely passive cooled case on Newegg, but it costs the same amount as a cheap computer...