Some of the small (1440 size) English lathes will do both metric and inch threads. I have heard that the metric threads are not "exact" but are close enough for practical applications.
Take a good look at the Clausing-Colchester line of lathes to see if they may suit, in the used market.
I bought a used Colchester Master 2500, with a buttload of tooling for pretty cheap through our Military Surplus sales. IIRC, it's 13x40, 2500 rpm top speed, and a pretty solid machine.
The one down side of the Colchester lathes of that era is that they use Gamet bearings of unique sizes only available through them, and they are fairly dear. OK, bloody expensive, actually. But it takes a pretty good effort to ruin them, too.
They are older, but not Old, like the plain bearing old machines.
If the Oil Patch is being beat to hell down there, like it is up here, I would expect that there would be a fair few used machines coming available as shops close down or downsize.
Hard to go too far wrong with new, though. Give a new machine a going over, stone or file off any rough or sharp edges, and get on with making it work for ya.
If you have not found Tony's site www.lathes.co.uk , you could do a lot worse than to bookmark it and have a look through the various machines that he has listed in his archive. He covers most of the 'not chinese import' brands pretty well, and it's a real handy place to take a quick look if you see a machine whose name or model don't ring any bells.