I too am faced with this decision. The Fong Kai 603 only has a 250watt PS... but it is supposidly a QUIET case. Being quiet is number one on my list. I have an Elan Vital T10 case now... it is the best case I have ever seen (and I have used many antec, enlight, inwin and addtronics, just not the Antec 830) I'd buy the T10 again in a heartbeat... except for the fact that it's all metal construction causes the fans in it (I have 6 including the cpu fan) to sound loud.
After reading many accounts of how quiet the Fong Kai is (due to the plastic exterior layer). I must ask, how quiet is the Antec SX830?
I used to wok on a lot of Dell and Gateway systems... and due to their plastic cases, some models are indeed VERY quiet (even with added fans). I'm hoping Fong Kai (who makes some of Gateway's "premium" cases) 603 won't dissapoint (and I'm even considering the FK320 for an additional $30, which comes with a 300watt PS)
FK603 250watt PS Mid tower ~$85 delivered from directron.com
FK230 300watt PS super(?) tower ~$115 delivered from directron.com
Antec SX830 300watt PS midtower $81.32 delivered from onvia.com
Anyone else consider noise as a primary criterion?
Brad
P.S. My Elan Vital case is EXCEPTIONALLY quiet with just the Powersupply fan (has "noise killer"

and a stock Intel fan. But once I add dual case fans, slot cooler and a GlobalWin celeron cooler (dual high RPM) it sounds like a high pitched refrigerator! I'm afraid the Antec will do the same (as most all-metal cases do).