Hi im purchasing and additional HD for my desktop. This purchase will require the purchase of a IDE controller card. The card supports RAID and the extra HD I was looking at is the exact same one as a HD I have in now. However...I found a larger drive by the same manufacturer for a better value so im really leaning towards that one. I am torn though because (from my knowledge) I can use RAID if I purchase that HD thats the same as one of my current ones, but if I get the better value HD i wont be able to utilize RAID because they arent the same. I could be totally wrong about that... Also which is a better choice? If i am correct...no RAID with the better value HD or is RAID incredibly awesome and I must have it? Thanks.