Welcome to the Forum.
You will find loads of help and advice on here.
You are obviously quite familiar with lathes and their uses. Obviously, horses for courses waht you choose will depend on what you want to do with it.
You seem to think that a mini lathe is too small for you expected use. That is understandable. You can do small work in a big lathe, but it is more difficult the other way round!
When I retired in 2003, my ML7 was replaced by an Engineers Tool Room BL12-24, (A Warco BH600 or Chester Craftsman in a different paint scheme ). maybe one of it's successors would meet your needs. But I opted for a conversion to VFD, with which I am very happy.
Possible suppliers, Amadeal, Arc Euro Trade, Axminster, Chester or Warco spring to mind,as possible suppliers.
The exact package on offer and the price will vary from supplier to supplier.
Others on here will give their experiences with these suppliers, ranging from favourable through to the opposite.
I can only comment on my experiences with three of the above, but won't here. See what others say about their machines.
Howard