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.
A new update has also just been released with several minor fixes - additions of new features and new camera models added to compatibility lists including the Canon 7D and all Olympus and Panasonic Micro 4/3rds models.
5.1 is available for download now and is a significant upgrade with simplified learning curves for new users and a raft of new editing features and enhancements as well as the usual addition of support for the latest SLR models.
Pro is $399 or $99 as an upgrade for previous PhaseOne customers. The standard version is $129. More details here.