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What is the best alternative to Picasa?

I use Picasa not because it is a great photo manager -- it's not, the manager is "sort of OK" for my taste. However, it combines a passable photo manager with a good "quick and dirty" image editor. It has the basic functions like cropping, resizing, contrast and color adjustment, and the one great feature -- "I'm feeling lucky" button, that works in 90% of the cases. Also, from time to time, I use one or two of the effects (like saturation or sharpening).

GIMP is great and I use it on a regular basis, but in most cases I just want to go quickly through the photographs of my kids birthday and make them more presentable without much fuss.

I'm looking for a native, open source replacement, something that would not miss the editing capabilities of Picasa and would allow me to quickly go through a collection of photographs and make basic edits. A function similar to "I'm feeling lucky" (automatic adjustment of contrast, color and brightness) would be most welcome.

EDIT: Yes, I have already tried a number of alternatives, if it is necessary I can produce a detailed list here, along with the problems I found. I'm posting that question because I hope to see a new name.