i would get a revolver that handles both 45lc and 45acp, the latter round being much cheaper.
I'm scratching my head, but off the top of it I cannot think of any revolver that chambers both 45 Colt and 45 ACP. 45 Colt rims are about .060 in thickness, but because 45 ACP is often shot with moon clips, there is about .030 more relief behind the cylinder in a revolver chambered for 45 ACP. That is why 45 Auto Rim was developed, to take up the space of about .090 behind the cylinder. I could be wrong, but unless custom modified, I cannot think of a revolver that chambers both 45 Colt and 45 ACP.
Except of course, my old convertible Ruger Blackhawk that came with two cylinders, one for 45 Colt and one for 45 ACP. I'm pretty sure that is the only way one can have an off the shelf revolver that chambers the two different cartridges, one that comes with two different cylinders. Current model Rugers (like my old Blackhawk) are great, they come with a transfer bar that makes them completely safe to carry fully loaded with six rounds in the cylinder.
Not so much with many of the Italian imports, most of them have the traditional lockwork that is only safe to carry loaded with five rounds, with an empty chamber under the hammer. This is an older 45 Colt Uberti Cattleman I bought about 20 years ago that has the traditional Colt style lockwork and is only safe to carry with five rounds and an empty chamber under the hammer.
Current Uberti revolvers have been modified with a retractable firing pin that make them safe to carry fully loaded with six rounds.
You said you don't want 'really expensive', or something like that, so I will not post any photos of any of my Colts.
The hell I won't. Here is a 38-40 Bisley Colt that shipped in 1909 along with a 38-40 Winchester Model 1873 that shipped in 1887.
Regarding rim sizes of old 45 Colt cartridges, all of these, except the two on the far right have rims much too small to be grabbed by the extractor claw of a rifle. The one on the far right is a modern 45 Colt round. Notice the much wider rim, and space above the rim that gives a rifle rifle extractor claw enough space to grab the rim. The round second to the right is a special 45 Colt that was developed for a Colt double action revolver, with an extra wide rim for the extractor to be able to push against.