I find buying digital cameras really frustrating, is there a good search enging out there for DigiCams that allow you to search by specifications, there's a few I'm really interested in.

I'm looking for

4 megapixel+ camera
3x or more optical zoom
Fast release time lag
Long(ish) shutter speeds available for night shots
Preferably AA battery power
Compact(ish) - not looking for a big SLR type jobby
Not essential but preferably smartmedia storage (although from what I can tell this is being fazed out)

I like the looks of the Casio QV-R40 as shown in the Biggy7 corner at dixons (was about to order but all sold - damn), just wondered if anyone else had any suggestions?