What's important for a RAID?

[sechs]

I'm getting ready to put together a RAID 0+1 array and have a couple drives in mind as possibilities for it; however, I'm really sure for what I should be looking.

What kind of performance characteristics are good (or best) for this kind of array? Which ones are more important than others?

For example, is seek time important, and would it be worth trading 0.5ms for better throughput?


Thanks in advance!

[sechs]

After more digging, I found this little tidbit of information. (It's good to know that I've been looking at the most important characteristics.)

Since I pretty much plan on putting everything on array, I presume that I'll be doing a lot of random accessing and, therefore, need to emphasize seek. Does this sound correct?