Ok, lets see. As far as I can tell the Antec 902 is also a Mid-Tower case, but I can say I own an Antec 300 and I am very happy with the build quality and features of the case.
As for the Difference between the Thermaltake Element V Standard, and the Thermaltake Element V Black Edition, I think it is only that the Standard has a plain steel finish inside and the black edition has a black painted interior. On the Thermaltake website the prices are listed as being them same for both models, I do not know if this will be the case at a reseller.
If I had to choose I would go with the Black Edition, I would prefer the painted interior myself, and that is if the cost of the case is not an issue. That said, the case has alot of really nice high end features and looks quite good also, which will stet it apart from some other cases. One thing I did notice is that it seems both Thermaltakes only come with one top fan the other is an optional upgrade as well are the VGA (exhaust) 50 x 50 mm fan x 2, I thought I would mention it just in case.
Here is a review of the Thermaltake Element V that I found: http://www.overclockersonline.net/reviews/thermaltake-element-v/