Seagate Barracuda 1TB 7,200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive ST310005N1A1AS-RK - $59.99
http://www.microcenter.com/single_product_results.phtml?product_id=0334293
Barracuda LP 2TB 5,900 RPM SATA 3Gb/s 3.5" Internal Hard Drive ST320005N4A1AS-RK - $89.99
http://www.microcenter.com/single_product_results.phtml?product_id=0334239
Hitachi 7K1000.C 500GB HDS721050CLA362 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -OEM - $39.99
http://www.microcenter.com/single_product_results.phtml?product_id=0349595
http://www.microcenter.com/single_product_results.phtml?product_id=0334293
Barracuda LP 2TB 5,900 RPM SATA 3Gb/s 3.5" Internal Hard Drive ST320005N4A1AS-RK - $89.99
http://www.microcenter.com/single_product_results.phtml?product_id=0334239
Hitachi 7K1000.C 500GB HDS721050CLA362 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -OEM - $39.99
http://www.microcenter.com/single_product_results.phtml?product_id=0349595