I want a fast 7200rpm 500GB drive. All I see is the Seagate Momentus 7200.4. Am I missing some newer models with higher density and performance? Are there any that might be coming out soon with strong promise of better performance? I used to be able to rely on storagereview.com for all the latest hard drive benchmarks, news, etc, but I can't seem to find any resources like it that are current any more.