Hi Pipper,
As long as the 220 fits your hand and points well for you, you can't go wrong with owning one for target and home defense. For home defense, you might want to consider investing in MMC sights. If you already have a Sig and like the bar-dot design over the 3dot sights, and wish to keep your sights consistant, they have the night sight bar-dots. They are the only company that I know of that offers that bar-dot adjustable. The "box-dot" ones are the same except in addition to a bar, (on the back sight, under the front dot), they also have another verticle bar going up each side of the rear sight. Hence 3 sides of a box w/a dot up front. This is just a friendly recommendation to file away if you ever opt for night sights. They are adjustable and offer a similar width of notch as factory fixed sights with the option of adjustability. Sorry, I don't have thier web address or number handy right now. But w/ get it on request. By the way, Sig sights are the best factory fixed sights IMHO in their standard, non-night sight, version.
If you like high capacity, but don't want to trade the other benefits of the Sig 220, you might want to consider buying a couple of extra mags and get some good instruction on speed reloading and home antipersonel tactics. If you are thinking about going into IPSC, the Sig is probably not the best choice. Some of the shooting sports seem to be geared for high cap., some are not. All in all, Sig 220 is a great choice. They DO have an all Steel version out now. Its a new "sport" model that weighs 42 oz. and has a compensator. Its mighty pricey. Special order only is my guess. Still low capacity, though. The standard aluminum alloy frame version is under 30 oz.
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"But now, he that hath a purse, let him take it, and likewise his scrip; and he that hath no sword, let him sell his garment, and buy one." -Jesus Christ (Luke 22:36, see John 3:15-18)