External flash and G6

I waas wondering if anyone could recommend a small external flash to use with the G6. I would like a little more power than what is put out by the internal flash.

Thanks

Canon 20D ,EOS-5D, 35mm f 1.4L, 50mm F1.4. 85mm F1.8,85mm f1.2L, 135mm f2.0L 18-85mm IS, 17-40MM f4L, 135mm soft focus, 100mm Macro, 24-70mm F2.8L
300mm IS F4L, 70-200MM f2.8L IS, 100-400mm IS L, 75-300mm IS,
Sigma 120-300mm f2.8, 1.4XAPO, 2.0XAPO
Tamron 28mm-75mm f 2.8, Tamron 180mm f2.8 macro, 580 EX flash, EOS3
Canon G6, EOS3
Hasselblad Xpan w/ 30mm and 45mm
Contax G2, w/35-70mm, 21mm, 28mm, 35mm, 45mm, 90mm
Contax Aria, 21mm, 25mm, 28mm, 35mm, 50mm, 85mm
Fuji GA645i, GA670III
Epson RD-1 with Zeiss ZM 35mm f 2 and lots of Leica's
Epson P2000 storage device

Your 580ex will work fine. I use a 420ex. If you use an off brand you probably won't have ETTL.

I just purchased the 430EX due to lens adapter shadow and it's great. 430EX is way faster than a 420 series. .

NOTE: 430EX and 580EX autofocus assist LED are not compatible with G6, I did confirm this at HENRY's store .

Yes and this what they say in Canon G6 manual on page 182

But what about the G5? Several times I have borrowed a 580EX to go with my G5 (yes, I know! The rig looks a liiiiiittle bit unbalanced : - ). I shot about 400 pictures this weekend at a dance competition and I would be very surprised if the flash autofocus assist LED didn't help the G5 focus. I don't think it would manage to focus without it, considering the light and distance.

You sure it was assist light from the coming form the flash not from the camera?

No, I can't say that I'm sure. But considering how problematic focusing can be in low light conditions with the G5, I felt that it must have had some help from the flash.

Yes you right, but in this situation nothing you can do as to use additional small torch (flash-light) to help focusing as I red somewhere that advice.
Really not be a problem to use internal, camera LED assist, but if you use adapters, convertors - this is a problem. Convertor block the focusing light and focus assist light does not work in EX flashes with G cameras. It will be nice to use teleconvertor with external flash, but you will have no focusing assistance for the low light condition unfortunately. Could be a good decision to go to hiperfocal for that situation. I had that programmed C1 and C2