PhaseOne have released Capture One 5 in both Pro and a stripped down standard version. Whilst it cant be extended with third party plugins like Aperture or Lightroom, it provides infinitely better quality processing than either of those options and is packed full of colour and effects features of its own that focus more on creating stunning but natural images as well as offering features such as film/lighting styles etc.

Pro is $399 or $99 as an upgrade for previous PhaseOne customers. The standard version is $129. More details here.