If you're interested in low light performance I would stay away from the LX-2. The in-camera noise reduction at higher iso values is very sever, blurring details and bleeding coulours. For some reason it can't be switched off. It's also quite a big camera compared to others.
I recently faced the same decision and spent lots of time browsing the dpreview.com forums. In the end I bought the Canon 850IS. I love the versatility the wide angle (28mm-105mm) gives (my bigger cam is a Panny FZ30 with 12x zoom, so I don't need such a big zoom on my compact.) The build quality is great and it has usual punchy canon colours without needing any post processing. It also has face recognition, very effective Image Stabilisation (good for lowlight with no flash) and decent performance up to iso 400, even 800 is usable. Major complaint from users is slightly soft corners when using the 28mm wide angle. If you don't fancy the wide angle and would prefer more zoom, you could also get the 800IS (35mm-140mm). Review of 800IS is here:
http://www.dpreview.com/reviews/canonsd700is/
The Fujij F30 is undoubtedly the best low light performer - bar none - though many have complained that exposure is very hit and miss outdoors in good light - often not metering well. With the canon every shot is a keeper - not so with the Fuji.