I guess the bottom line is that no case is perfect for everyone ..........
These two (Antec SX and F-K 320) are comparable, but quite different in design and construction.
The Fong Kai is constructed of lighter gauge metal but gains strength and rigidity through a series of struts and vertical bracing ......... the side panels do seem flimsy compared to the Antec, but they are tight fitting and rattle resistant, the whole structure is no heavier than necessary and is still designed stout enough for dual Xeon processors and 12,000 rpm hdd's ....... every review I have read comments on the high quality construction .......
The styling is elegant to some and ugly to others .......... personal preference!
The psu quality and the cooling ability of the F-K's is second to none, in it's price range, and these cases' have been consistantly recommended by Anandtech in many of their budget priced system recomendations for well over a year, ..... ever since they did a case review of the F-K 320 and the 603.........!
If you do want to nit-pic, the Antec has some down sides also:
The psu seems to be mounted too low in the case, the area above is wasted space, causing the psu and the boxed rails it is mounted on to be closer than necessary to the cpu socket and hsf on some mb's for easy access....... when replacing/changing hsf's or cpu's .......... too bad they (the rails) are not at least removable .........
The two piece plastic bezel, seems like a good idea, but is cumbersome in use, as part of it remains tethered to the led or switch wiring unless un-plugged from the mb ........
The door on the SX-1030 is not what it should be for a lockable option ............
I would personally be happy with either one of these cases, and look forward to the arrival of the smaller Antec SX's ........... !
Sorry this is getting so long winded ............ ?