PSE as in Photoshop Elements? For the same price range there is PixelMator, http://www.pixelmator.com/
iPhoto isnt a bad app for the price either.
I have iPhoto 08 and it supports RAW format but I use Photoshop CS3 to edit my RAW files.
I have never used Aperture since I have been using Photoshop almost daily for the last 9 years.