You said you need 2+TB of storage. In a two disk mirrored RAID setup, if you use 1TB drives, you'll only have 1TB storage total (as the second will be an exact mirror of the first). So if your initial post is accurate, you'll need a 2x2TB RAID 1 setup.
Edit: Unless you meant you need two separate 2x1TB RAID 1 drives... If so, disregard my post.