its HDD time again. i like to replace my hdds in my main rig every 9-12months to keep from loosing a drive. my machine runs 24/7 and is the file server for my entire network. i need a 1tb and a smaller fastish drive for OS. from what i can tell the WD black 1tb and black 640gb are the best option but i want to know that you think. i need something thats reliable and fast BUT has to be cheap. if you find a deal link it here. i'd like to stay around $100-120 for both drives. less is always better.