Re: Motherboard choices
I have the X58A-UD3R and think it's a pretty awesome board. I'm having no issues whatsoever getting the board to overclock (my CPU and RAM are another story...) but the northbridge and southbridge cooling are good, the MOSFET's have nice heatsinks, and it has a pretty good power management chip with the Dynamic Energy Saver system. It also has plenty of onboard LED's to indicate higher-voltage conditions, power system phase, overclock level, CPU temperature level, and more. I went with it over the ASUS for a few reasons. It was cheaper than the ASUS board I was looking at ($209 vs. over $300), had more USB connections, had more SATA and eSATA connections, had an IDE and FDD port should I ever need them, 2 rear FireWire ports, and otherwise pretty much the same as the ASUS. I think these extra features make it a better board, and the build quality is nice too. You may lose a bit in customer service though as I've heard Gigabyte's support isn't good, luckily my board runs fine and I didn't need to RMA it.
Open the ASUS and the Gigabyte pictures side by side and compare the ports. The Gigabyte wins hands-down on port selection. That's my reason for choosing it (not to mention it's $100 less than the $300 ASUS). As for southbridge heatsink, I really don't think you need that sort of cooling on it, you need a good northbridge heatsink and MOSFET's as those channel power into the CPU.
As for quality, the Gigabyte also has high quality solid capacitors, high quality inductors and MOSFET's, and a double-thick 2 oz. copper PCB as part of Gigabyte's Ultra Durable 3 design. This board is as good as all the other ASUS boards I've seen in terms of components.