I wouldn't try to talk you out of the Kodak especially with funds being tight. I've been in that boat myself. Although if you could wait, I think you might be able to find a Omega later on in some of the sales for as good a price as you might have to give for the Kodak.

As for the caliber get the .50 caliber. You're going to have better luck with that caliber. Some of the .45 calibers were hard to tune in. And there is nothing a .45 can do that a .50 can not match or do better.