Ye Micheal did ask me about building a machine for somebody up your way so I bet it was you.?

Regards the Lead screw Vs Ballscrew. Ballcscrew won't be any smoother action than most decent lead screws it's just more accurate and effiecient in most cases so less work for the motors etc. But without seeing or hearing your machine hard to tell if you have Bad screws or worn out machine.? What you think is rough action could just be poor low resolution or poorly setup machine.?

Lots of reason why you may have been getting rough action but won't get into that now.
Regards what machine then I can't honestly say or recommend because without knowing your budget etc it's like saying how longs a piece of string.!!

What I will say is be careful because Price doesn't always reflect what your getting and High price doesn't always mean Good machine.
Cheap can some times good but it's also little like playing Russian roulet without knowing how many bullets are in the chamber.? . . With some Chinese offerings Often there's 5 bullets.!!!

My suggestion is Don't Rush into buying and find a machine you like look of. Then try to find someone who's using one or knows the builder/Company to get a feeling for how it performs etc.

If you see any just post on here and we'll take look for you.