Good choice, you will love the 357sig. Another good point, because of the bottle neck design feeding malfunctions are very rare.
One other thing is the ammo is a bit more expensive and a little harder to find sometimes.
I was spending so much on ammo I decided to start reloading, here are about 450 I loaded this past weekend.
http://img.photobucket.com/albums/v461/HOSTIL1/Guns/P1000792.jpg