sat images... where to find good ones !?

[Max]

Hi guys,
I have a little problem, it's for a while that I'm looking for a good provider of sat images (of Europe mostly), even not-free ones.

I need to look at some areas where I have heard of ancient interesting structures, but I need some very detailed, good quality images say that I need 50, 30, 15 and maybe also 10meters virtual height, so I'm talking about very detailed view, that's cause details I'm looking for could be just little evidences on soil and lot of plants, grass etc all around...

Now... I have a long set of interesting coordinates but cannot find still now ANY good sat images provider for the places I'm looking at now!

And also, I'd like to make some bird views of cities and some small towns, just for fun... but, even in that case I can just found just partial coverage from e.g. microsoft's thing website (about same of google) ...few detailed views.... old images, some are of 10 years ago with very low resolution ! No good!

SO: anybody knows about good quality, reliable, also non-free sat images provider I could use for that things ?

Any help will be really appreciated!

Kind regards,
Max