So i'm looking for a new digi cam. I've got a 2.1 mp Olympus right now that i'd like to replace.

I can get the Sony DSCF707 for a really good price. At 5 mp, its a great camera, but i'm wondering if i'll really need all the extra "jazz". The 4mp alternatives i've looked at look pretty decent for quite a bit less.

I guess my question is, for a normal 4 x 6 or 5 x7 print, will a 4mp vs. 5mp picture's difference really be noticeable?