Need a stable and quick Raw NEF viewer

I looking for a quick, no foolin' around raw nef viewer to handle NEFs - everything from D300 /s, D7000, D700, D3S and D800.  Just want a real quick preview, keep or delete - I'll work on them later in Lightroom or PS. Right now I want to spend 10 or 15 minutes here and there to trim the images.

Thanks