If you have TechNet or MSDN subscription you can get newer build versions from there. However, if you don't have that...like most of us...the RC release is the version that Microsoft provided and expect people to be using.
If you scour the net, you can find RTM (release to manufacturer) releases that are available. If you do decide to pursue one, just be sure to check hashes and get it from a reliable source so you don't end up with any viruses, spyware, or malware on your machine from a potentially tampered with version. In addition, these hacked copies come with no key and you cannot use the RC keys with the RTM....so you will get 30 days before you have to start doing the re-arm trick to get a total of 120 days out of a newer release.
I'm still using the RC release. I've got the RTM at work...but haven't seen any reason or need to update my home machine to this version as the RC is working out just fine until I get my legit key in Oct.