Yet another one of my sideways looks at technology.
Why not buy a camera that was top of the range model from 2 years ago? One of those plus a smart reader and an extra 64Mb of memory will still cost less than half that of a humungo-pixel modern job.
The new 4/5/6 mega pixel cameras are ususable. Not trying to annoy anyone but unless you own an A3 printer you will never, ever see the quality you are paying for. Once tried you will also give up manipulating your images because the file sizes turn Photoshop into glue. Unless you do this for a living you will give up and drop the resolution.
Tell you what, assume I'm a demented loon and sneak a look at the LCD mode display settings on such beasts. Oh dear, all the early adopters settle on shooting the vast majority of their work in the resolutions which give sensible file sizes and output quality. Those resolutions are standard and half the price when you buy outdated top of the range cameras from respected manufacturers. Try a search on the Digital Depot, they specialise in these deals.
Regards
Rob