If these are available in your area, id get one of them:
http://www.systemcooling.com/superflower_sf550-01.html
Iv got one, and its a Super Flower 500w PlugN PSU. Its got a 14cm FAN! It doesnt have dual rails, but its single 30A 12v rail is more then enough. It has three modes, silent, auto (thermostatically controlled), and turbo mode. I run it on AUTO, and its silent at all times, even when iv been playing games or rendering CAD work for hours. It has a nice finish, and looks very good inside the case. Mine is the Plug-N version, so it is modular, and comes with nicely sleeved cables.
My system has an overclocked x2 4400+ , 7800gtx, 2x 250gb SATA HDD's, and 4 12cm cooling fans and iv never had any problems with it. Should work fine in SLI too. Theres plenty of connectors, i only wish they provisioned for more than 2 SATA plugs, but thats not really a problem. It has Active PFC also.
As you can see, i believe there is also a 500w version available if you wanted more power. They also come in a variety of different colours (i even saw a metallic pink one in the store ) , so you can get one to suit any case.
I was orignally going to get a 500w Antec phantom, but im really glad i went with this one. Getting the heat out quickly and efficently is much better than boxing it in and then radiating it out. There relativly cheap too, the modular version cost me $129 AUD, and the standard edition (everything the same execpt it is not modular) would've cost me $99 AUD. To put in perspective, i would have been getting a good deal to get a phantom at $220 AUD, and the Enermax 600w PSU you talk of costs about $190 AUD.
May seem like im a LITTLE :roll: over enthusastic about this PSU, but not many people know about it, and i chose it not knowing what it would be like, and im definatly glad i picked this one in the end.
btw: Super Flower (TTGI in the USA i think) power supplies are made in the same factory as the Enermax PSU's. Strangly enough, my Super Flower sports enermax's trademark delayed shutoff system.