I just bought an 85 to replace my 1650 and, if you can get the same results I'm getting by updating the torch (and I see no reason why you wouldn't) it will be money well spent.
I just got the thing set up and dialed in, cutting 8mm plate at 65amps, 33mm a second, square, dross free....brilliant.
The main reason I went to the 85 and not just the torch upgrade was, the ability for fast torch change to manual cutting without any hassles.
Of course. having the latest tech had nothing to do with it.....
Anyone in the market for a cheap 1650???
Probably help if you live in or near Aussie.....