I can't seem to find a website that does a large test with the "best" air cooling cases. I do searches individually and compare those results. But when you're not looking up that particular case, the results vary from test to test.
I find a new case to be the best at air cooling everytime I look up a seperate case.
For example:
Thermaltake Level 10GT, HAF X, FT02, Rosewill Thor V2, Raven 03, Cosmos II, CM Trooper, TJ11, Win-Buc, Corsair 600T, Lian Li PC90, etc...
Sums up my thoughts exactly.
I also tried, for experiment's sake, to collate results from different sites, calculating the % advantage of one case over the other to build a master list. But the thing is that a case shows different cooling (uh, duh) for different systems, jumping around 5% ahead or behind the closest competitor, so no definitive answer here.
Hence, "life lesson 1037": don't base your choice of a case on any one review.
On your list of top performers, Corsair 600T and Lian Li PC90 came out on top fewer times than the rest from your list. And like you said, there are those isolated articles where Antec Sonata, Cubetek XL-Tank or Aerocool XPredator somehow beat the usual champions. Further checks do not assertain those conclusions but, as well as did not SEEM logical.
To your list of frequent winners I would add the Antec DF-85 (cool, but noisy and lower build quality) and In-win Dragon Rider (wins clearly only once on the reputable silentpcreview.com, but by a large margin! it's pretty much a mesh box with fans in it though, which makes sence
)
I am down to these cases though.
Rosewill Thor V2, FT02B-W, HAF X, and Thermaltake Level 10GT.
I've observed that Lvl10 GT and Haf X rarely took the 1st prize, while FT02 or RV03 often did. Although, as you said, this may be due to how reviewers select the comparison chassis
And, the few reviews of Rosewill Thor v2 that I saw all put it on top of their charts. Again, RV03 or HAF not there, except on anandtech.
Now, since I live in Australia and we don't have Rosewill cases here, I find the following news pretty exciting and sure you'll find interesting:
Tom compares Thor v2 and Enermax Fulmo GT. Thor loses by 1 degree on CPU and wins by 3.4 degrees on 4-way SLI GPU cooling, while being 2db louder.
http://www.tomshardware.com/reviews/fulmo-gt-thor-v2-vh6000bws,3072-7.html
Now, if I read it correctly, you can only add one 140mm fan at the bottom of Thor v2 on top of the stock configuration:
http://www.rosewill.com/products/1798/productDetail.htm
With Enermax Fulmo GT though, you can install additional (!) 2x18cm left side fans (on top of the existing 2
, additional 12cm (20mm deep) right side fan, one more 23cm fan on top, 23cm fan on the bottom and 2 optional 14cm fans inside the case if after all this your HDDs are running hot
http://www.enermax.co.uk/fulmo-gt.html
If I had no issues with Enermax's size (D 674 x W 235 x H 640) my dilemma would be over with this discovery.
Which leads me to my next point: Why did RV03 come off your list while Haf X remained? If because of the bit-tech review where Haf is 6 degrees ahead of RV03, then I found this was not entirely consistent and Raven was beating the Haf X lot of the times. Again, correct me as I feel I may be a little biased here.
However, I do agree that RV03 has very limited potential to make the case cooler except only for the HDDs (the fan on the right side blowing in the back of the motherboard). Adding the 2 front and 1 rear fans, according to one forum on OC Club, did not make a noticeable difference to a 3-way SLI set-up. I wonder if Haf is much better in that sense.