Amazon currently has the G1x for sale for $730 shipped. I think that's a pretty good price,
How? Amazon persistently inflate their prices and give scattered arbitrary service on e-sales. "Free shipping" is not always a bargain. Especially with items like Canon cameras that must be imported from Asia in the first place.
Currently you can buy a G1X on the Net for around $600 in HK and Australia. Postal charges at about $50 and global warranty can make the purchase overseas of what is an overseas manufactured item more attractive than buying through the megalith Amazon.
As for size and convenience, you're right the G1X is a bit larger than the G12 . And if you don't want superior images, far better light capture with substantially less signal noise, but prefer small file email images and snapshot monitor viewing or small machine prints only, then the G12 is easier.
Even simpler, why not simply use your smart-phone 8MP camera?
On the other hand, if you want something closer to Leica quality in 'rangefinder' style size digiwhizz then the Fuji X100 beats the Canons hands down for just another couple hundred dollars. That's street price, NOT Amazon or inflated eBay price.
However, whatever gives you joy is the camera you should choose.