New to SATA

Hello!

I have this mobo:
http://usa.asus.com/products.aspx?l1=3&l2=12&l3=45&model=407&modelmenu=1

In the manual, it syays: 2x Serial ATA with RAID 0, 1 function

Now, I have been using IDE all my life, and I am just getting into SATA. I know it uses a differnt power connector, so I will get that. I went to newegg to see what SATA drives they have. They have Serial ATA150 drives and SATA 3.0Gb/s. I am going to guess that the 3.0gb one, I don't have, and only newer mobos have that. I ask that can if I use both Serial ATA150 drives and SATA 3.0Gb/s(the 3.0gb drive will just downgrade the speed and work?). If there is any more info I need to know about SATA, that would help me out! Also if you know any HDDs that have SATA that would work w/ my mobo would also help me out. 

Thanks! 

>>2
Wrong way to put it, SATA II (2, 3.0 Gb/s, whatever) just has twice the bandwidth of SATA I (300). While SATA I has more bandwidth than IDE (150)..

All of this is a moot point however, because bandwidths of current drives barely break the 60s. Both SATAs are compatible to one another..

Get the drive that is has the largest GB/$$$ ratio
I would try for Western Digital's RE drives, which are tested more caefully in their 5-year warranties (the others are only 1-year but paying an extra 15$ for an extended 2-years only ammounting to a 3-year warranty)

Also, I prefer Segate's Barracuda 10 series family..