Why limit yourself- SATA is up to 6 now-not 3. Backward compatible with SATA 3 so..................
I have an Asus P6T Se\12gb Ram, etc. It's SATA3. But I had to add a card for USB 3.0 (works great) and a nice eSata @x outputs with room for many HDs (I have 3 at the moment. I also needed a PCI slot-so watch what you get, My Echo Layla3G is PCI and I love it. I had AP2496's (ran 2 using a sync) wotked great, They are around here somewhere. @ work very well together. All you need is a short dig cable.
I am about ready also-I have the 3rd Gen i& in my laptop and it's pretty done quick. I7 920 in the desktop.
But when I upgrade I want to have at least 5 years of peace. Also a DIY'er. Always have been. I already have 3 SATA 6G Hard drives , but using them as externals until I get the right board. Asusu has been my boards of choice for ever. Some say nay but I've never had an issue.
Gigabyte Nvidea has been my videa card choices for a l,ong time also.