Great machines, for their own purposes, but not great 'only' machines for a generalist gunsmith, I think.
I should also mention, having a smaller 'second' lathe, free to use for quick light jobs, can sure be handy!
The DSG lathes are massively heavy built machines that generally come with a huge long headstock spindle bore length, making a cat head at either end, only an option with very very long barrels. Some are actually longer through the headstock, than their between centers distance. Makes for a great heavy duty lathe spindle, not so much for gunsmithing.
The Hardinge is a great lathe for making small precision parts, but not a great generalist lathe either, as much as I lust after one.
I had a 10 inch Rockwell for a while, much lighter than the 11 inch model, more along the lines of an updated 9 or 10K South Bend.
We had a very new(ish) 13x40 Standard Modern at work, that the folks looked down their noses at because it wasn't a hulking big brute of a machine, but it was easy to use, and made good parts. I actually bid on it, and was out by a couple bucks (IIRC, just under $70) on my bid, so it went to someone else. IIRC, they replaced it with a slightly larger Colchester machine.
I have a Myford Super 7, that is pretty well tooled up, I have a essentially NOS Emco Super 11, sitting on a pallet awaiting some love and attention, and a 13x40 Colchester Master 2500, that is awaiting the install of a new motor (220v, in place of the original 550v) and VFD. <sigh> Too many toys, not enough shop!
If you gotta have a new lathe, I can't much help you, as I have not stayed very current there at all. If you can deal with a used machine, check out the lathes.co.uk website, as a reference source, to see what the various machines that get listed, amount to.
There is a decent looking LeBlond on Crown Assets right now, from the Halifax Dockyards. It looked about the right size, has the shorter headstock, allowing barrels through the headstock work, and may fit your needs.
Cheers
Trev
Not a gunsmith but I have a Myford ML7 with a fair bit of tooling. It was old when I bought it in 1973.
Just re-crowned my friends Cooey 22. Would never part with the Myford.