G10 will be cheap now the G11 is out.
I have a G10 and have used for professional work since they came out. Stunning, but not very good with high ISO - JUST useable at 400 for me, and only at a push at that. In good light it is brilliant and I won't bother changing it for the G11. Plenty of DPS published with it. Even a 10 foot print off it.
You should be able to find a G10 lurking somewhere, or a used one for a song. The G11 has a swinging screen ( an unimportant upgrade from my point of view) a bigger sensor with fewer MPs - so better quality again than the G10. If the G11 would fit the diving housing for the G10 I would change for it...but it doesn't and I am not changing BOTH, so happy to live within the constraints of the G10.
The lens on the G10 is brilliant - super sharp and don't bother stopping it down too much, it doesn't need it.