The 5" unfluted model 25, product code 100924, is a favorite among Forum members.

Many regard it as one of he most accurate 45 LC revolvers Smith and Wesson has produced
I am sure that you will find many prospective owners if you end up placing it in the For Sale section

Personally I do not see an advantage to trading from a 45 LC revolver to a 45 ACP revolver

The 45 LC cartridge has a much wider range of projectile weights and designs available for it. Especially if you are a hand loader

An option you could look at (though the purists will yell at me for suggesting the modification of a S&W) is to have the cylinder of your existing revolver machined for moon clipped 45 ACP. Several gun smiths can do the job in such a manner as to allow the firearm to safely chamber and shoot both the 45 LC and 45 ACP cartridges.