I have both a Lee Turret and the Lee Load-Master, and I use both.
IMO, the question to start with here is "how many rounds per month?"
A Lee turret--which is much more flexible, really--will easily work for a reloader shooting 1000 rounds per month or less. IOW, it will, in a simple "churn 'em out" mode often used for handgun rounds, load about 180-200 rounds per hour.
The Load-Master output is about double that--but its learning curve is steep, and it is tricky to setup. (NuJudge is right--see the videos and the Load-Master forum if you really want to consider this.
But, I think that you need to answer that question first about how many rounds you plan to shoot.
The Classic Cast Turret is probably what I would consider getting, especially if I were reloading only for a couple of calibers.
Here is a link to a comprehensive review of the press. Were I buying again today, I would get this one. Meanwhile, my updated standard Turret does work fine with the cartridges I currently shoot (.38 / .357, 10mm, .45ACP, .223) and I have no doubt it and the Classic Cast Turret is just fine for .44 Mag.
As for other observations or questions--I think the Lee Auto-Disk measures will work fine, although I haven't used them with those powders. Update or purchase the "deluxe version" and use the Adjustable charge bar, and you should be good to go.
An added observation: You mention the injuries you have had--for me, one other factor in keeping the Load-Master up and running is that I have a "sore shoulder." The Lee Turret (any turret) will take four strokes to produce a finished round; a progressive only takes one. But--and I do consider myself a Lee afficiando--were I to buy a progressive again, I would look at the Hornady LnL, as Walkalong mentions below. However, that setup, apples to apples (so to speak), is about $650.00 or so compared to nominally $250.00 for the Load-Master.
Jim H.