Lightroom is now at version 6 and the upgrade to 6 is what is available and the price is the same. Download the trial version of LR Creative Cloud and use the 30 day trial. If you are satisfied then you can upgrade to LR 6 perpetual License or the Adobe Creative Cloud Photographers package.
Just be aware that if you decide to upgrade to Lightroom 6 after using the trial version, the dehaze filter, the blacks and whites sliders in the adjustment brushes and a few other features will not be part of your Lightroom 6 installation. Those features were added after Lightroom 6 was released. They will not be part of the standalone Lightroom version until such time as a new upgrade is released.