You have literally tons of options. Your choice will depend partly on intended use and partly on personal preference. S&W N-frames are modern classics and have an appeal all their own. It pained me to send a lovely model 57 back to the seller last week due to mechanical issues. However, if you're going to send thousands of full pressure loads downrange, it might be best to choose something else. They will shoot loose with continuous use of heavy loads and the so-called "endurance package" did very little to mitigate that. I treat mine like slightly stronger .44Spl's and keep them at 1200fps or less. I say "full pressure" because many factory loads are not. If it's a 240gr at 1200fps, it's far below full pressure. My 29-3 and 629MG are excellent shooters.
An elegant single action in a similar strength class is the stupidly-named Uberti Callahan. It's only slightly beefier than their Colt SAA replicas and has the 1860 grip frame.
For a similarly finished single action capable of withstanding a lifetime of full pressure loads, there is the Old Model Super Blackhawk. This one has been trimmed to 5½" by Bowen and fitted with Ajax stags.
There are various New Model .44Mag single actions including the Bisley Hunter model...
...standard Bisley, this one worked over by David Clements...
...Bisley Vaquero...
....and 50th anniversary Blackhawk.
For guns in a strength class all their own, the big Ruger DA's are capable of nuclear 50,000psi loads. The Super Redhawk is my favorite platform for a dedicated hunting sixgun.
For the ultimate in strength, this .44 started life as a 4 5/8" Super Blackhawk. I later converted it to a Bisley, then had David Clements spiff it up with a new front sight, lanyard ring, Belt Mt basepin, Bowen rear sight, freewheel, action job and roundbutting.
In its final guise, Jack Huntington opened the frame window and fitted an oversized six-shot cylinder, 4 5/8" octagon barrel, custom #1 style front sight and completely hand finished it. It is fitted with Dall sheep grips by Rob Rowen and capable of the longest, heaviest loads.