Well I have an Addtronics WTX case for my system and all I can say is that it is wonderful. It is a Server case and the mobo is placed the other way round. It has 9 fans in it and allowed me to push my Athlon 1.4 to 1575Mhz at STOCK Voltage 143FSB with no voltage tweaks. The CPU runs at a MAX 48 Celcius at full load (Prime torture test) under Win200 with a GlobalWin WBK38.
I have 4 HDs in there in RAID (60GXps 40GB) and they produce heat as well plus a GF3 non overclocked but it would go 235/550 (Asus 8200 Deluxe).
I use an Enermax 550W PSU BTW ($340 for it Where I live)
The Case cost me $300 as well. (There is still room for expansion in there). It comes with wheels, washable filters, locks, and sevral nice extras such as server mobo power connectors.
Do I recommend it - DEFINITELY!!!! The best case I ever had. But I can;t afford to lose my data casue I'll lose my job. So 2 of the HDs are RAID 1 and two RAID 0.
I stress the systme quite hard I have to say and it still remains quite cool. Although the intake fan is a monster (you can stay 3 feet away from it and still feel the air coming from it.