Sadly I don't own a G12, just borrowed one.Ah, that makes things greatly more expensive then
But aldvan is quite right - when used to FF, anything else is rather a compromise.
I like the idea of a Leica . . . but I am very (very, very) brand-loyal. I would love to see Canon producing a rangefinder once again (Fuji managed it!) or a m4/3.
How long has it been since you shot on a crop camera (or have you ever shot on one?)? The biggest thing I think may take some getting used to is that the 7D is currently the only Canon crop camera that covers 100% via viewfinder . . . even the 60D has slightly less (no idea about older models).
If you were even considering a portable P&S, the S95 is great for what it does . . . it give you the ability to HAVE a camera that you CAN make do wonderful things . . . when you don't think you need/want to have a camera around but need one in a pinch. Alas, mine was brazenly stolen and I haven't laid eyes on it since my vacation at the end of last month . . . it's probably still in my wife's bag It's a nice casual shooter.