I'm a fan of the Millenium Pros. An ex-cop buddy of mine has the PT145, which is essentially the same thing in a double stack, and he likes it. Since you're already picking up a Glock 19, though, I would decide if it will fill a role that the G19 won't. True, it might be more easily concealable than the Glock. However, in a SD situation, whether CC, home or car, I would rather have 15+1 rounds of hot 9mm+P or +P+ (the Glock will easily handle that) running full speed out of a 4" barrel than 6+1 rounds of .45 handicapped by a 3.25" barrel. But that's me. If it's for range use, than the Taurus probably won't be much fun, either. It's not made for that.
Besides, .22 LR is a lot cheaper than .45 ACP. I'd stay with the original plan and get the Buckmark.