I had one of the early PT145s, which experienced some problems with the plastic frames cracking out at the pin holes- *chunking* would probably be a better description. We had a FR thread going about it, and I could probably find it in my bookmarks if you're interested. Taurus kept their word on their outstanding guarantee though and many of those who'd had problems with the 145 went for the 945 instead as a replacement.
I got in an involved trade with a county deputy whose department had gone to the .40 S&W...and I had a Glock 22 he wanted, and got. And his wife wanted to get him an off-duty/backup gun for their first anniversary present, and she knew he liked my PT945, and what did I want for it...? So i got away from it, and in the last couple of years, he's put around 4000 rounds through it without the slightest problem. Figures.
I wouldn't feel at all badly equippped with a 945. The stainless versions are especially night, but also available in an aluminum allow frame if light weight is a requirement.
There are those who claim that short-barrel [4¼-inch, for the 945] barrel .45s may not generate enough velocity for some hollowpoints to expand. Likewise, they note that .45 ball from a 5-inch GI barrel can pass through an unarmored opponent and injure those who may be behind them. While I like the idea of someone I'm mad at trying to plug as many leaks as possibly, I've come to the conclusion that one answer to both problems is to run the most reliable possible .45 ball ammo through the shorty barrel guns. I'd try a few different 230 ball loads for your pistol and use whichever one was most reliable. How many rounds total do you have through it so far? It takes 150 rounds to establish 98% reliability, 600 to prove 99%, and over 2000 to ascertain 100% reliability with a particular gun/ammo/magazine combination...