There's a possible problem. Most newer mtrbds. provide only 1 IDE(legacy) port, so having 3 IDE devices may not be so readily installed. Why, because SATA is the primary access ports. If you want to keep the 3rd IDE device then either add an IDE adapter/card to access such. However, it maybe better to go full SATA, instead. If you find a dual IDE port mtrbd. its probably an older model, so take that into consideration. Just check the specs that Asus provides on such details via the support website.
I am having my friend build me a new system.
Here is what I have so far
500gb Sata HD
Amd X2 6000 processor
600 watt Thermaltake PSU
4 gb 1066 pc 8500 memory
320 gb ide hd
2 ide dvd burners
200 gb ide hd
ati 3870 overclocked video card
Looking for a Asus motherboard around 130 dollars to complete this build.