Best SATA cables?

I have recently changed cases and I need to buy two SATA cables. One for my HD and one for my CD-ROM. I've read a lot of reviews on New Egg about SATA cables, most being negative reviews. Some of them break and others just don't work. And I noticed that some have higher transfer rates. If I buy a 3.0GBPS for my 7200RPM hard drive, would it improve performance? Would a higher transfer rate cable improve performance for my CD-ROM also?