Have you considered a Tanfoglio in .45? That is my second favorite .45 platform, after the 1911. Same ergonomics as a CZ, but not as bulky as the 97. Totally different feel than a 1911. Sights are easily upgraded, and Patriot has all the goodies if you want to do more to it. A good used standard model Witness can be had in $500 - 600 range.
Another vote here for the Tanfoglio/EAA Witness/Defiant .45, as I have two of them and love them!!! My all time favorite Pistols in .45 ACP
Left to RightTanfoglio/Witness .45 1992
Tanfoglio/Witness .45 2005
SAR K2-45 2013
My 1992 EAA Witness .45 has over 18,000 rounds through it, as it was/still is my favorite Major Power Factor for USPSA/IPSC.
I also used to use it as my main CCW Pistol in Winter and carried it in a Don Hume IWB Holster. It has also served as a
Home Defense Pistol. Over those 18,000 rounds it has needed some new Recoil Springs and I run Wolff +10% Magazine Springs.
I have also, at one time, converted it to run .45 Super for hiking in Bear Country, as backup to a Mauser Rifle in .30/06.
If it's frame was ever going to crack, I would think it would have done so by now.
My 2005 EAA Witness has been used for Defensive Pistol Classes and as a CCW. I still tend to use the 1992 Witness more.
The only reason I bought it was because I just wanted a new one I had not run hard. Not a Safe Queen, but I do tend
to shoot it sparingly.
It should be noted that EAA no longer imports and supports Tanfoglio Pistols.
Tanfoglio Pistols are now imported by the Italian Firearms Group- IFG, as the Defiant Series.
The Sarsilmaz SAR K2-45 is an interesting Pistol in .45 ACP and very well made. Mine has been accurate and reliable.
The only cons on it is that it is quite heavy, fully loaded, and the Grip is larger than the Tanfoglio Pistols.