Very good cases.
Coolermaster, Antec, ThermalTake, ALienware... Many top brands mod the Chieftec case because its very well designed and the huge bulk savings make it very cheap too. When i say mod the cheiftec, i dont mean mod the deisgn, they actually use CHeiftec cases, its printed on the drive rails and everything. The only difference between a Coolermaster ATC-710, Antec 1030AMG (excl. PSU), Thermaltake Xasier, Alienware case and the original Chieftec is the front panel and paintjob.
You can find loads of reviews on the web for the aforementioned cases, and theyre all good. The one downside most reviewers mention is the weight of the case, the steel version is one heavy case - although that does show the quality construction. I can say mine is very heavy, definately nothing to take to LANS (i read up a lot before settling on looks and getting the Coolermaster myself). The same chasis is available in aluminium though, i think cheiftec sell an alu version and so is one of the TT models. It seems to be a very popular chasis for modders, wether its because the case is particularily good for it, or simply because its such a hugely popular chasis, im not sure.
There's quite alot of good towers out, imo the chieftec chasis is the best option for a low cost, very high quality, very well cooled case if you dont mind the weight.