You guys are so traditional!
I actually like both of those and didn't see the 220 when checking out the GSR.
I bet that the GSR is awesome looking in your hand. Is it over kill? not for me, but it might be for you, but you can have it done the way you want, it's called customization.
I can also see a market for the 220 as I am a 1911 guy and would transition into the SA 220 well and not have to train the motor skills again because I am so use to the 1911. I think it is a smart move for SIG if they were to market the SA 220.
I would buy that SA 220 in a minute! the GSR although I think it looks good and I love custom stuff like that but I probably wouldn't and just stay with the real 1911 platform.
Edited: Cause my post made no sense at all. I think I got it now!