The newest MKIIIs have a cast frame but are in reality the toughest of the breed...
The newest being anything made over the last 20-years or so.
Another thing to consider is the sight cut in the slide. The adjustables might suffice for a plinker, but not much else. Fortunately, most of the adjustables can be easily replaced with sights that don't suck. Unfortunately, some of the adjustables are slightly milled/lowered into the slide and that complicates replacement. The sight cut is somewhat unique and IMO in the wrong location (too far forward to avoid having to cut the FP stop plate).
Sooo, my recommendation for a workman-like Hi-Power would be a cast frame MkIII with a simple dovetail sight cuts - in blue (because I like blue). If you plan on shooting a bunch of lead and want top accuracy you could consider a slower twisted barrel down the line.
