In my opinion, Sig makes one of the finest pistols on the market. I have been shooting a P226, the high capacity version of the P6 (or P225), for about 20 years. It still functions like the day it came out of the box and looks almost that good - plus, it just fits my hand better than most of the other hi-cap pistols of that era. The P6 model has a smaller grip frame due to the single stack mag and the trade-ins can be found all over on the internet. I say "go for it" and you (or your wife) will not be disappointed.
"CL"