That list was for the UK wasn't it? Cases vary by continent.
Before buying ANY case, I recommend you google for several reviews on a case you like. At least, if you care about plunkin' down $100 or so.
If you want good ventilation, I'd say try to find a case with 120mm (12cm) fans/fan slots. They're much quieter and move more air. If you can't, go for one that has 92mm fans, although they are louder than 120mm typically. Steer clear of the horrid 80mm fans and even worse, 60mm fans. Eww!
It's funny that they say aluminum cases dissipitate heat better. It's a load of crock. SECC steel tends to be much thinner than aluminum (which bends more easily, thus aluminum cases are thicker). Sure aluminum might radiate more heat, but it also absorbs more heat. When it's that thin and just internal temps, you might notice a .5 degree difference. Basically, none. The problem with cheap steel cases is that they can make a rattling noise sometimes, and cut your fingers a little (although aluminum can too) when you're building it. Not all steel cases have sharp edges though. There are some that wrap or bend the steel so that it cna't hurt you. Grinding down edges helps too sometimes.
The advantage of steel is that they're typically cheaper and lighter weight than the big heavy aluminum cases.
For the average first time builder I'd recommending buying a steel case without acrylic windows, possibly black in color (goes with anything), and probably mid-atx size. CoolerMaster has some nice cheap cases. I was recommending those in another forum awhile back. They had a great one for $30. Ultra and Antec put out a few nice affordable cases as well. Just remember to read reviews so you have an idea of just what you're getting.