So far I have not had a SATA version issue on any gear. I've mixed any level with any level drive and controller. There are those that fret about it and I smile and carry on.
There is an issue with XP and SATA and drives over 127GB but you are moving to 7 so all I need to do here is note that limitation. Plenty of web articles about it.
I have an asus a7n8x that still runs well but the hard drive is about to die. I know there is a sata connection on this mb but I am not sure which sata type hd to get. I'd guess sata 1 will work but what about the sata 2 or sata 3 type?
I'm currently running XP but plan to upgrade to Win7.