You already seem to have decided upon your technical requirements ("3x zoom,
5mp +/-" ). I trust these were arrived at scientifically rather than just
because the numbers seem right when you look at various cameras' sales
pitches.
The basic question is what do you want from your camera. I personally have
always felt that megapixels are over hyped at the expense of other features,
but my view may be shaded by the fact that I hardly ever print bigger than
6x4. I therefore chose (a couple of years back now) to go for a big zoom
(10x), so I wouldn't need to do much cropping or enlarging, and not worry
about the megapixels. If your requirements are different then you will make
different choices.
The most useful resource to me, when I was researching what to buy, was the
following web site:
http://www.dpreview.com
Their in-depth reviews of most camera models are extremely useful.
Regards
Keith