The Sig P230 is a very nice little .380 and would be hard to replace. If you have your heart set on moving to a 45acp and selling the Sig is the only way you can afford to make it happen, I would look for a nicer gun than the Taurus.
I own and carry thw 24/7 compact in .45acp. It's a great little gun. Trigger takes some time to break in but is still not great. I wouldn't tell you not to buy one, but it's a $300 gun at best. Hell, I'd trade you if you really wanted lol
I have a P230 and even though I don't carry it very often, I sure wouldn't get rid of it. It's one of the better 380's. I really love it and so does my wife. Definitely a keeper.